投稿時間:2022-01-05 00:36:13 RSSフィード2022-01-05 00:00 分まとめ(38件)

カテゴリー等	サイト名等	記事タイトル・トレンドワード等	リンクURL	頻出ワード・要約等/検索ボリューム	登録日
AWS	lambdaタグが付けられた新着投稿 - Qiita	Lambda を使用して、Amazon EC2 インスタンスを一定の間隔で停止および起動するにはどうすればよいですか?	https://qiita.com/sanajima/items/eb55fb5b078c768a13bd	Lambdaを使用して、AmazonECインスタンスを一定の間隔で停止および起動するにはどうすればよいですか教材実作業停止して起動するECインスタンスのIDを取得しますECの画面から当該ECインスタンス選択リージョンも確認しておくJSONポリシーエディターを使いIAMポリシーを作成しますIAMの画面からポリシーを選びポリシーの作成をクリックJSONタブをクリックコピペして適切なタグをつけて名前をつけて作成LambdaのためのIAMロールを作成しますIAMの画面からロールを作成さきほどのポリシーをアタッチして適切なタグをつけて名前をつけて作成ECインスタンスを停止および起動するLambda関数を記述するこのまま実施しますAWSLambdaコンソールで、Createfunctionクリックします。	2022-01-04 23:28:03
python	Pythonタグが付けられた新着投稿 - Qiita	化石がマイナスからKaggleを始める～レベル最弱の「タイタニック号を救え！ ない」3 ～	https://qiita.com/ammonite_404/items/79b01eb187e898e7d831	化石がマイナスからKaggleを始めるレベル最弱の「タイタニック号を救えない」前提数学力・統計力・技術力がほぼすべて「ゼロより低い、マイナス」の化石エンジニア・アンモナイトが生き残りを目指して賞金が欲しくて、Kaggleに挑戦する。	2022-01-04 23:23:10
python	Pythonタグが付けられた新着投稿 - Qiita	Google ColaboratoryでサクっとStreamlit（最小構成）	https://qiita.com/gudapys/items/62eda02bdb3de5530a23	GoogleColaboratoryでサクっとStreamlit最小構成colabでサクッとStreamlit最小構成使い方メニューバーから、ランタイムgtすべてのセルを実行このノートブックはGoogleが作成したものではありません。	2022-01-04 23:04:40
js	JavaScriptタグが付けられた新着投稿 - Qiita	GatsbyJSとStrapiでデータをやり取りする	https://qiita.com/Taisei_Mochizuki/items/a922cd57b609386267b0	権限の欄に移動し、公開したいテーブルのfindとfindoneにチェックをいれて保存します。	2022-01-04 23:08:15
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	気づけばプロ並み　foreach文について	https://teratail.com/questions/376646?rss=all		2022-01-04 23:52:29
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	進行方向に向き続けるように	https://teratail.com/questions/376645?rss=all		2022-01-04 23:51:05
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	ユーザーフォームの2つ目のリストボックスがうまく動作しない	https://teratail.com/questions/376644?rss=all	ユーザーフォームのつ目のリストボックスがうまく動作しない前提・実現したいことつ目のリストボックスを選択するとつ目のリストボックスにデータが表示されるユーザーフォームを作成中。	2022-01-04 23:31:09
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	【vim】vimに書いたプログラムをメモ帳にコピペしたい	https://teratail.com/questions/376643?rss=all	cygwin	2022-01-04 23:24:01
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	写真の特徴をもとに検出したポイントの色濃度を求めたい	https://teratail.com/questions/376642?rss=all	写真の特徴をもとに検出したポイントの色濃度を求めたい前提・実現したいことSwift・Python・OpenCV初心者です。	2022-01-04 23:21:30
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	さくらのVPSサーバーの設定中、 ApacheのWebSite画面を表示しようとしたが、下記のエラーが出て表示されません。	https://teratail.com/questions/376641?rss=all	さくらのVPSサーバーの設定中、ApacheのWebSite画面を表示しようとしたが、下記のエラーが出て表示されません。	2022-01-04 23:13:41
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	機械学習にて、自作データセットをラベル化したい	https://teratail.com/questions/376640?rss=all	以下、手元にあるものです。	2022-01-04 23:07:13
AWS	AWSタグが付けられた新着投稿 - Qiita	Lambda を使用して、Amazon EC2 インスタンスを一定の間隔で停止および起動するにはどうすればよいですか?	https://qiita.com/sanajima/items/eb55fb5b078c768a13bd	Lambdaを使用して、AmazonECインスタンスを一定の間隔で停止および起動するにはどうすればよいですか教材実作業停止して起動するECインスタンスのIDを取得しますECの画面から当該ECインスタンス選択リージョンも確認しておくJSONポリシーエディターを使いIAMポリシーを作成しますIAMの画面からポリシーを選びポリシーの作成をクリックJSONタブをクリックコピペして適切なタグをつけて名前をつけて作成LambdaのためのIAMロールを作成しますIAMの画面からロールを作成さきほどのポリシーをアタッチして適切なタグをつけて名前をつけて作成ECインスタンスを停止および起動するLambda関数を記述するこのまま実施しますAWSLambdaコンソールで、Createfunctionクリックします。	2022-01-04 23:28:03
技術ブログ	Developers.IO	公式チュートリアルでNext.jsに入門してみた（後編）	https://dev.classmethod.jp/articles/introduction-to-nextjs-part-3/	nextjs	2022-01-04 14:53:20
技術ブログ	Developers.IO	[小ネタ] クロスケーブル直結でAWS SnowconeのNFSサーバーを利用してみた	https://dev.classmethod.jp/articles/how-to-do-cross-cable-connect-snowcone-nfs-server/	awssnowcone	2022-01-04 14:03:17
海外TECH	MakeUseOf	Vaonis Stellina Review: The$4000 Cheat Mode for Astrophotography	https://www.makeuseof.com/vaonis-stellina-review-astrophotography/	astrophotographythe	2022-01-04 14:56:48
海外TECH	MakeUseOf	The 7 Best Practices for Using Concept Maps	https://www.makeuseof.com/best-practices-using-concept-maps/	concept	2022-01-04 14:47:22
海外TECH	MakeUseOf	How to Use Proportional Editing in Blender: A Beginner's Guide	https://www.makeuseof.com/blender-proportional-editing-how-to/	blender	2022-01-04 14:30:12
海外TECH	MakeUseOf	How to Build a Career-Boosting Online Presence	https://www.makeuseof.com/build-career-boosting-online-presence/	presence	2022-01-04 14:16:41
海外TECH	DEV Community	Introduction to OpenStack with MicroStack	https://dev.to/donaldsebleung/introduction-to-openstack-with-microstack-1f5j	Introduction to OpenStack with MicroStackIn this article we will learn what OpenStack is followed by a hands on session where we install MicroStack in our local development environment and explore some basic features of MicroStack PrerequisitesDue to the nature of OpenStack this hands on session has non trivial system requirements on top of knowledge and skill requirements Knowledge and skill requirementsIt is assumed that you Are comfortable with the Linux command line and troubleshootingUnderstand the core concepts behind hardware virtualization practical experience with a production grade hypervisor such as VMware Workstation or KVM would be beneficialUnderstand the core concepts behind cloud computing in particular IaaS practical experience with a public cloud provider such as AWS Azure or GCP would be beneficial System requirementsIt is assumed that your local development desktop or laptop Has at least CPU cores or more recommendedHas at least GiB of RAM GiB or more recommendedHas at least GiB of available storageIs running a sufficiently recent version of Ubuntu or another Linux distribution where Snap packages are supportedIn particular if your desktop laptop does not satisfy the last requirement e g if you are running Windows or macOS it should contain enough hardware resources to run a VM satisfying the requirements above with hardware acceleration and nested virtualization enabled so that you can run VMs inside that VM Either way YMMV Another possible solution if you do not meet the system requirements is to provision a bare metal instance on a public cloud such as AWS Azure or GCP For example AWS offers a range of bare metal instances powered by AWS Nitro However do note that bare metal pricing is orders of magnitude greater than most other instance types ranging from USD per hour upwards If you re ready to spend hundreds of dollars on a simple tutorial like this one by all means go ahead so long as you are fully aware that you are solely responsible for any and all monetary costs incurred With the prerequisites addressed let s get started OpenStackReference OpenStackThe official OpenStack website describes the project as a cloud operating system that controls large pools of compute storage and networking resources throughout a datacenter all managed and provisioned through APIs with common authentication mechanisms Simply put it is an open source platform designed to function as a private or public cloud Typically OpenStack would be deployed on a fleet of production grade servers in a datacenter or datacenters though in this article we ll see how we can set up our own single node micro cloud with MicroStack a beta offering at the time of writing by Canonical the company behind one of the most successful Linux distributions ever Ubuntu Figure Our own micro cloud in a bottle desktop laptop How cool is that Credits to Steve Spangler Science for the imageOpenStack is a project under the Open Infrastructure Foundation a non profit organization founded for this purpose though it has expanded to house related open source projects such as Airship and Kata Containers as well OpenStack is licensed under the open source Apache license and its source code can be found on GitHub or through the official website MicroStackReference MicroStackOpenStack is comprised of a collection of components known as services that can be selectively deployed to provide APIs to access various types of infrastructure resources which you can learn about through the official website For this reason among others deploying OpenStack is not a trivial task MicroStack is Canonical s distribution of OpenStack made simple and accessible similar to how Ubuntu is a distribution of Linux made simple and accessible to the average user also offered by Canonical In a moment we ll see how installing MicroStack is as simple as running a single snap install command and initializing it for use is equally simple as well also requiring a single command No wonder the project describes itself as follows The most straightforward OpenStack ever Apart from being a great introduction to OpenStack MicroStack can also be used for Micro clouds consisting of a small number not necessarily just of nodesEdge computingContinuous Integration Continuous Delivery CI CD pipelinesFor a larger number of nodes such as would be found in a typical datacenter other distributions such as Charmed OpenStack also offered by Canonical or Red Hat OpenStack Platform RHOP may be more suitable many of which are bundled with commercial support Anyway enough talk let s get our hands dirty Installing MicroStack and provisioning our first instanceReference Get started with MicroStackFirst ensure snapd is installed on your system If you re on a sufficiently recent version of Ubuntu snapd is already installed by default and you do not have to do anything Otherwise you may have refer to the link above and follow the instructions specific to your distribution MicroStack is currently in beta Install it from the beta channel in devmode sudo snap install microstack devmode betaOnce that completes initialize it sudo microstack init auto controlThis may take about minutes or more to complete depending on your hardware specs On my MacBook Air from with GiB of RAM and CPU cores CPU threads it took about minutes and running the above command twice before it successfully executed to completion Once complete you should see the following line at the end microstack init INFO Complete Marked microstack as initialized Check the version microstack openstack versionPrint a very long help message microstack openstack helpNow let s launch our first instance Here we use the CirrOS image a minimal Linux distribution specifically designed as a test image for use in OpenStack We ll call the instance test microstack launch cirros name testCreating local microstack ssh key at home donaldsebleung snap microstack common ssh id microstackLaunching server Allocating floating ip Server test launched status is BUILD Access it with ssh i home donaldsebleung snap microstack common ssh id microstack cirros You can also visit the OpenStack dashboard at Addendum the name CirrOS is likely inspired by cirrus clouds which are thin and wispy in appearance From the command output depicted above we see that an SSH key pair was automatically generated for accessing this instance and the instance IP is in my case yours may differ Now connect to this instance using the provided SSH private key replacing the private key path and instance IP as appropriate ssh i home donaldsebleung snap microstack common ssh id microstack cirros Now explore the instance with a few commands feel free to try out your own uptime up min users load average whoamicirros hostnametest iduid cirros gid cirros groups cirros uname aLinux test generic Ubuntu SMP Fri Jun UTC x GNU Linux cat etc os releaseNAME BuildrootVERSION gafe dirtyID buildrootVERSION ID PRETTY NAME Buildroot Nice So we see from uname a that the CirrOS image was likely derived from Ubuntu in some way Exit the instance exitConnection to closed We learn from the official MicroStack tutorial that microstack launch is a wrapper for microstack openstack server create View commands for managing MicroStack instances microstack openstack server helpList running instances microstack openstack server listThis prints out a table which could be difficult to read if your terminal width is small List running instances in JSON much more readable IMO microstack openstack server list f json ID baf c a fcebfac Name test Status ACTIVE Networks test Image cirros Flavor m tiny Stop the instance replacing the instance ID as appropriate microstack openstack server stop baf c a fcebfacView the instance state again microstack openstack server list f json ID baf c a fcebfac Name test Status SHUTOFF Networks test Image cirros Flavor m tiny Restart the instance microstack openstack server start baf c a fcebfacAnd check the instance state again microstack openstack server list f json ID baf c a fcebfac Name test Status ACTIVE Networks test Image cirros Flavor m tiny Try SSHing into the instance again to confirm it is back up ssh i home donaldsebleung snap microstack common ssh id microstack cirros exitAfter you re done exploring terminate the instance microstack openstack server delete baf c a fcebfacConfirm that the instance has been terminated microstack openstack server list f json Great Now that we ve seen some basic commands for dealing with instances let s go a bit deeper and explore some other common features Flavor managementReference OpenStack Docs FlavorsIf you ve dealt with Amazon EC before or a comparable public cloud IaaS provider you ve probably realized by now that OpenStack flavors are analogous to EC instance types or equivalent Basically they define the amounts of various hardware resources compute network storage allocated to an instance most notably the number of virtual CPU cores and memory The main difference between EC instance types and OpenStack flavors is that the former is predetermined by the public cloud provider but the latter can be managed by you subject to the hardware resources available since you own the cloud Let s dive in with some simple commands Print a help message microstack openstack flavor helpCommand flavor matches flavor create flavor delete flavor list flavor set flavor show flavor unsetList the available flavors in JSON microstack openstack flavor list f json ID Name m tiny RAM Disk Ephemeral VCPUs Is Public true ID Name m small RAM Disk Ephemeral VCPUs Is Public true ID Name m medium RAM Disk Ephemeral VCPUs Is Public true ID Name m large RAM Disk Ephemeral VCPUs Is Public true ID Name m xlarge RAM Disk Ephemeral VCPUs Is Public true So here we see we have flavors by default FlavorvCPUsMemory MiB m tinym smallm mediumm largem xlargeNot bad for a micro cloud The thing is my development laptop only has GiB of RAM so m small would already be stretching the limits of my physical hardware and anything m medium and above would be out of the question So let s remove some flavors that we won t be able to use anyway microstack openstack flavor delete m xlarge m large m mediumConfirm that they have been deleted microstack openstack flavor list f json ID Name m tiny RAM Disk Ephemeral VCPUs Is Public true ID Name m small RAM Disk Ephemeral VCPUs Is Public true Display detailed information on remaining flavors microstack openstack flavor show m tiny f json OS FLV DISABLED disabled false OS FLV EXT DATA ephemeral access project ids null disk id name m tiny os flavor access is public true properties ram rxtx factor swap vcpus microstack openstack flavor show m small f json OS FLV DISABLED disabled false OS FLV EXT DATA ephemeral access project ids null disk id name m small os flavor access is public true properties ram rxtx factor swap vcpus Here we see a few more properties being printed such as the amount of swap space for that flavor and whether the flavor is publicly accessible I ve also just realized that MiB of RAM seems a bit small for proper Ubuntu images that I would like to import and boot later but GiB of RAM would be a tad too large What if I could create instances with GiB of RAM Simple since I own this cloud I can just define my own flavor microstack openstack flavor create m mini vcpus ram disk This creates a new flavor m mini with vCPU core GiB of RAM and GiB of storage Confirm the new flavor is created microstack openstack flavor list f json ID Name m tiny RAM Disk Ephemeral VCPUs Is Public true ID Name m small RAM Disk Ephemeral VCPUs Is Public true ID ddeb c c fb dbfe Name m mini RAM Disk Ephemeral VCPUs Is Public true View details on this new flavor microstack openstack flavor show m mini f json OS FLV DISABLED disabled false OS FLV EXT DATA ephemeral access project ids null disk id ddeb c c fb dbfe name m mini os flavor access is public true properties ram rxtx factor swap vcpus In fact we ve already covered out of at the time of writing commands for managing flavors the remaining two are set and unset which deals with modifying details of existing flavors Now let s look at another service the image service Image and snapshot managementReference Get imagesAn image is a template from which an instance is launched Let s see what operations on images are available microstack openstack image helpCommand image matches image add project image create image delete image list image member list image remove project image save image set image show image unsetView default images microstack openstack image list f json ID aebd eb aefce Name cirros Status active There is only one by default cirros View details microstack openstack image show cirros f json checksum beecfdceeefafe container format bare created at T Z disk format qcow file v images aebd eb aefce file id aebd eb aefce min disk min ram name cirros owner bfcaadffeadc properties os hidden false os hash algo sha os hash value feaadafabcaadfbcedcdafbbebbcaebddcdaf owner specified openstack object images cirros owner specified openstack sha addecffdcdddcbecbbcdffdbccdb owner specified openstack md beecfdceeefafe protected false schema v schemas image size status active tags updated at T Z visibility public Our cloud isn t much use if we can only launch CirrOS instances which are minimal and only suitable for demo and testing purposes What if we could import an image for a more popular practical distribution such as Ubuntu Fortunately we can do so with the openstack image create command microstack openstack image create helpTake a moment to skim through the help info In particular we see that we can pass a file lt FILE gt option to create a new image from a local disk file Fetch the latest Ubuntu LTS cloud image for KVM wget Now create our image microstack openstack image create ubuntu focal disk format qcow file focal server cloudimg amd disk kvm img publicConfirm it is created microstack openstack image list f json ID aebd eb aefce Name cirros Status active ID ffcd b fa baf eabb Name ubuntu focal Status active Let s try to boot an instance from our new image with our newly created m mini flavor microstack launch ubuntu focal n my mini ubuntu f m miniNote microstack launch is specific to MicroStack while openstack server create is applicable across OpenStack distributions You may wish to try launching an instance with openstack server create as an additional exercise SSH into it as usual Now poke around the instance feel free to try out your own commands whoamiubuntu hostnamemy mini ubuntu free m total used free shared buff cache availableMem Swap df ThFilesystem Type Size Used Avail Use Mounted on dev root ext G G G devtmpfs devtmpfs M M devtmpfs tmpfs M M dev shmtmpfs tmpfs M K M runtmpfs tmpfs M M run locktmpfs tmpfs M M sys fs cgroup dev loop squashfs M M snap lxd dev loop squashfs M M snap snapd dev loop squashfs M M snap core dev vda vfat M M M boot efitmpfs tmpfs M M run user uname aLinux my mini ubuntu kvm Ubuntu SMP Fri Nov UTC x x x GNU Linux cat etc os releaseNAME Ubuntu VERSION LTS Focal Fossa ID ubuntuID LIKE debianPRETTY NAME Ubuntu LTS VERSION ID HOME URL SUPPORT URL BUG REPORT URL PRIVACY POLICY URL VERSION CODENAME focalUBUNTU CODENAME focalExit the session when done Now that we have a known working Ubuntu image we probably won t use CirrOS anymore Delete the image and confirm the deletion microstack openstack image delete cirros microstack openstack image list f json ID ffcd b fa baf eabb Name ubuntu focal Status active You should now only have the ubuntu focal image left Before we conclude our tour of OpenStack let s look at one more feature snapshots Snapshots record the state of an instance at a particular time so that we can revert to that state later on if something goes wrong for example In fact as far as OpenStack is concerned a snapshot is just an image SSH into our my mini ubuntu instance and run the following commands within our instance sudo add apt repository ppa donaldsebleung misc sudo apt update sudo apt install y donaldsebleung com yes openssl req x newkey rsa keyout key pem out cert pem sha days nodes sudo mv key pem etc donaldsebleung com sudo mv cert pem etc donaldsebleung com sudo systemctl enable now donaldsebleung com serviceThis installs my personal website shameless promotion here P Check that it is up and running wget qO https localhost no check certificate lt DOCTYPE HTML gt lt Hyperspace by HTML UP htmlup net ajlkn Free for personal and commercial use under the CCA license htmlup net license gt Exit the session Now stop our instance microstack openstack server stop my mini ubuntuCreate a snapshot donaldsebleung com from my mini ubuntu microstack openstack server image create my mini ubuntu name donaldsebleung comNow see that it has been added to our list of images along with ubuntu focal microstack openstack image list f json ID efab bb f cfd dacbc Name donaldsebleung com Status saving ID ffcd b fa baf eabb Name ubuntu focal Status active If the status of your snapshot is saving as shown above wait a few seconds and query the image list again until the status changes to active At this point if your laptop is resource constrained like mine with only GiB of RAM you may wish to first terminate your existing my mini ubuntu instance as we will be launching another instance shortly microstack openstack server delete my mini ubuntuNow launch a new instance my personal website from the donaldsebleung com snapshot microstack launch donaldsebleung com n my personal website f m miniSSH into the instance If everything is working as expected the web server should already be up and running wget qO https localhost no check certificate lt DOCTYPE HTML gt lt Hyperspace by HTML UP htmlup net ajlkn Free for personal and commercial use under the CCA license htmlup net license gt Exit the session Cleaning upReference OpenStack in a snap Terminate my personal website microstack openstack server delete my personal websiteIf you won t be using MicroStack again in a short while but would like to keep it around for future exploration disabling the snap could be an option sudo snap disable microstackThen whenever you need MicroStack again you can re enable it with sudo snap enable microstackAlternatively if you might not use MicroStack again for quite a while and would like to free up disk space like I do removing it with the usual snap remove is an option sudo snap remove purge microstack ConclusionWe learned What OpenStack isMicroStack as an OpenStack distribution that just works How to install MicroStack provision our first instance and connect to itHow to manage instances flavors images and snapshotsOf course this is just the tip of the iceberg Some things we haven t had the time to look at in this tutorial Identity access management with KeystoneAdvanced networking configuration with NeutronManaging OpenStack from the web console with HorizonBy the way the compute and image services that we explored are known as Nova and Glance respectively At the time of writing MicroStack only comes with these core services with many additional services left out This means if you get the chance to try out a proper production grade OpenStack distribution you might have the chance to work with other services not available through MicroStack Zun for containersIronic for bare metal provisioningMagnum for container orchestration and so on Finally here are some extra resources for your interest OpenStack official websiteArchitecture Guide gives a detailed overview of RHOP with advanced examples beyond the scope of this tutorialI hope you enjoyed this article ReferencesIntroducing two new Amazon EC bare metal instances AWS Nitro OpenStack Open Infrastructure Foundation Airship Kata Containers OpenStack on GitHub MicroStack OpenStack Services openstack servicesCharmed OpenStack Red Hat OpenStack Platform Get started with MicroStack ga overviewInstalling snapd CirrOS cirros testOpenStack Docs Flavors Get images OpenStack in a snap Keystone Neutron Horizon Zun Ironic Magnum Architecture guide	2022-01-04 14:42:44
海外TECH	DEV Community	Solidity Basics for JavaScript Devs Part 3	https://dev.to/fllstck/solidity-basics-for-javascript-devs-part-3-585	Solidity Basics for JavaScript Devs Part I wanted to publish the third part of this series after I finished my first Solidity project alongside the source code of that project Sadly I got a few issues connecting the frontend to the Hardhat local network Anyway I figured I could still publish it unfinished at least all the tests pass haha Here is the link to the repo The examples from the book Hands On Smart Contract Development with Solidity and Ethereum but rewritten for Hardhat and TypeScript Again the frontend doesn t work I started one with Preact but had some issues with the local network and didn t find the time to solve this Maybe some of you might figure out how to get the frontend connected to the local network Anyway here are the last three Solidity tips for you my fellow JavaScript users Contracts have a receive fallback FunctionThe EVM calls two special functions when someone sends transactions to your contract that no other functions could handle They don t need the function keyword and must be external payable contract MyContract fallback external payable called when none of the contract s functions match the called function signature receive external payable called when the call data is empty The Fallback FunctionYou can use the fallback function to delegate calls to different contracts Since contracts deployed on the Ethereum blockchain are immutable you need some indirection if you want to upgrade them over time This can be done with a contract that only implements the fallback function that will relay calls to any function to a contract address You can change this address and in turn indirectly change the implementation of the contract The Receive FunctionYou can use the receive function to handle calls only concerned with Ether and nothing else For example when you want to store a token amount into the smart contract s balance Solidity Variables are Initialized by DefaultBecause solidity uses static typing the language knows what type every variable at compile time Each of these types has an initial value the EVM will use when it executes Initial Valuesaddress xarray dynamic array fixed fixed size array with initial valuesboolean falseenum first enum elementfunction external a function that always throws an errorfunction internal a function that returns initial values if a return is definedint mapping empty mappingstring struct a struct where all members are set to initial valuesuint Requesting a Wallet Account Requires a Manual Call of eth requestAccountsBrowser extension wallets usually block access to the accounts they manage from websites The user has to allow the website to access it manually Somehow Ethers js doesn t ask for permissions automatically when you want to use a wallet account You have to manually send a request to the wallet before you can use an account signer const provider new ethers providers WebProvider window ethereum chainId await provider send eth requestAccounts const account provider getSigner The call to the asynchronous send method will block until the user accepted the request ConclusionWith this article I finished my first steps into Solidity smart contract development and web in general I hope I could clear things up for you and my project helps you to get started I saw thousands of views on this series so I pursuing more ideas in that direction this year So if you re a web JavaScript developer who wants to learn more about web stay tuned	2022-01-04 14:24:22
海外TECH	DEV Community	How do you feel about regex?	https://dev.to/ben/how-do-you-feel-about-regex-14c2	How do you feel about regex Regex seems to have a broad array of love and hate How do you feel about it Do you seek to use or avoid it as a problem solver and how much do you understand it	2022-01-04 14:22:52
Apple	AppleInsider - Frontpage News	OWC's Atlas Pro memory card and reader range aims at content creators	https://appleinsider.com/articles/22/01/04/owcs-atlas-pro-memory-card-and-reader-range-aims-at-content-creators?utm_medium=rss	OWC x s Atlas Pro memory card and reader range aims at content creatorsOWC has introduced a number of storage products for photographers and content creators including the Atlas FXR CFexpress card reader and a number of high performance memory cards The OWC Atlas Pro range is said to provide photographers shooting RAW images and videographers working in K to get the highest workflow efficiency possible The collection consists of memory cards with high data rates as well as a similar high speed but also small card reader OWC claims the Atlas FXR is the smallest CFexpress card reader that can work with a Thunderbolt connection though it operates on Gbit USB C Similar in size to a credit card and roughly a seventh of the size of similar readers it is extremely compact and able to be carried around at ease Read more	2022-01-04 14:53:11
Apple	AppleInsider - Frontpage News	TP-Link launches four HomeKit cameras at CES	https://appleinsider.com/articles/22/01/04/tp-link-launches-four-homekit-cameras-at-ces?utm_medium=rss	TP Link launches four HomeKit cameras at CESSmart home firm TP Link is introducing four HomeKit compatible security cameras as it brings its European Tapo brand to the US One of four new smart security cameras from TP LinkTP Link previously announced and then cancelled plans to add HomeKit support to devices under its Kasa brand At the time the company said only that this was due to changes in our roadmap Read more	2022-01-04 14:21:22
Apple	AppleInsider - Frontpage News	Best deals Jan 4: Half-price Amazon Halo Band, $11 USB-C dock, more!	https://appleinsider.com/articles/22/01/04/best-deals-jan-4-half-price-amazon-halo-band-11-usb-c-dock-more?utm_medium=rss	Best deals Jan Half price Amazon Halo Band USB C dock more The best deals for January include off the Canon EOS RP the Amazon Halo Band for half price and four Meross HomeKit compatible smart plugs for Best Deals for January To help you get through the January sale chaos we ve curated some of the best deals we could find on Apple products tech accessories and other things for the AppleInsider audience Read more	2022-01-04 14:06:33
Apple	AppleInsider - Frontpage News	Withings announces new Body Scan smart scale with integrated ECG	https://appleinsider.com/articles/22/01/03/withings-announces-new-body-scan-smart-scale-with-integrated-ecg?utm_medium=rss	Withings announces new Body Scan smart scale with integrated ECGAhead of CES the Withings Body Scan has debuted allowing users to monitor segmental body composition heart rate and vascular age with Apple Health integrations Withings Body ScanThe all new Body Scan scale features a tempered glass platform and a retractable handle used for administering the lead ECG There are four weight sensors and ITO electrodes within the platform as well as an additional set of stainless steel electrodes within the handle Read more	2022-01-04 14:09:03
Apple	AppleInsider - Frontpage News	Targus' CES 2022 lineup includes 'Find my' backpack & USB-C dock featuring fingerprint ID	https://appleinsider.com/articles/22/01/03/targus-ces-2022-lineup-includes-find-my-backpack-usb-c-dock-featuring-fingerprint-id?utm_medium=rss	Targus x CES lineup includes x Find my x backpack amp USB C dock featuring fingerprint IDTargus has announced its lineup for CES including a Find My equipped backpack and a USB C hybrid universal K Quad dock Travelers and commuters can keep track of their gear with Targus new Cypress Hero Backpack Constructed from recycled plastic water bottles it boasts Apple s Find My technology Additionally if users lose their iPhone and still have the Cypress Hero backpack with them they can press a button to ping their iPhone Once pinged the iPhone will emit an audible signal helping the user locate it The backpack comes with a replaceable battery that can be charged via USB and is highly integrated to prevent thieves from easily removing it Read more	2022-01-04 14:06:36
Apple	AppleInsider - Frontpage News	Sengled unveils new HomeKit Video-Sync light strips, smart outdoor string lights	https://appleinsider.com/articles/22/01/03/sengled-unveils-new-homekit-video-sync-light-strips-smart-outdoor-string-lights?utm_medium=rss	Sengled unveils new HomeKit Video Sync light strips smart outdoor string lightsSmart lighting company Sengled has announced a number of HomeKit compatible products at CES including light strips that sync to streaming content and outdoor string lights Sengled s smart outdoor Wi Fi light bulbsFor example the company is set to release a new Bluetooth smart bulb that sports health tracking features The A Bulb which won a CES Innovation Award will allow users to monitor their sleep track vitals and detect falls It s still in the very early stages of development however Read more	2022-01-04 14:12:17
海外TECH	Engadget	Apple's Mac Mini M1 is $50 off at Amazon	https://www.engadget.com/apples-mac-mini-m1-is-50-off-at-amazon-140511856.html?src=rss	Apple x s Mac Mini M is off at AmazonWhile we saw the Mac Mini M drop in price during the holiday shopping season you have another chance to grab the desktop for less right now Amazon has the base model with GB of RAM and GB of storage for or less than usual It s not a record low ーthe machine dropped to last month thanks to a sale combined with an addition coupon ーbut it s a noteworthy discount for this time of year in which most gadgets return to normal prices after the seasonal rush Buy Mac Mini M at Amazon The Mac Mini M runs on the same processor as the latest MacBook Air which means you should notice a big improvement in performance especially if you re coming from an aging device It has an eight core CPU and an eight core GPU along with a Neural Engine that handles machine learning tasks In our experience with the Air the M chipset was blazing fast helping sites load almost instantly and running native apps smoothly And you ll get all of that in the most affordable M machine if you go with the Mac Mini ーeven at its normal price of the Mini is cheaper than the MacBook Air making it a good option for those who don t want to break the bank while investing in a newer faster computer If you appreciated the minimalist design of previous Mac Minis you ll like the latest model because it hasn t changed much Its silver exterior is only interrupted on one edge by the machine s port array which includes two Thunderbolt ports two USB A connectors an HDMI port an Ethernet port and a mm headphone jack If you ve been itching to update your family s computer or you just want to add a capable desktop to your home without spending too much money this sale on the Mac Mini M is worth considering Follow EngadgetDeals on Twitter for the latest tech deals and buying advice	2022-01-04 14:05:11
海外TECH	Engadget	TCL's affordable 30 Series phones are coming to Verizon and T-Mobile	https://www.engadget.com/tcl-30-series-ces-2022-smartphones-launch-date-price-140051967.html?src=rss	TCL x s affordable Series phones are coming to Verizon and T MobileTCL continues its tradition of launching a barrage of devices at CES and it s a similar story to last year with two new series smartphones headed to the US later this year Let s start with the TCL XE G It has a inch display at x resolution and up to Hz refresh rate With a mAh battery it runs on one of Mediatek s Dimensity chips the Dimensity which have been designed to work better with AI tasks like image processing nbsp Talking of images there s a triple camera system but no need to get too excited There s a depth sensor and a megapixel camera meaning that most of the work will be done by the single megapixel main camera sensor It ll be able to record video up to p another reminder that these are affordable phones first impressive specs are less of a priority Much less TCLThe TCL V has a bigger inch display running at x resolution That s more pixels than the XE but lacks the Hz refresh rate Compromises It runs on a Qualcomm Snapdragon chip ーagain different to the XE with a more substantial megapixel primary camera working alongside a MP super wide shooter and a MP macro lens Unlike the notched front facing camera of the XE the bigger V has a pinhole in the screen for its MP selfie cam It also has a mAh battery which should ensure it lasts the day given the lightweight specs of the device Both devices are coming exclusively to the US but on different carriers The TCL XE G launches on T Mobile date TBC while the V is landing on Verizon Adoption from two US carriers will make TCL s phones a more realistic option than in previous years However we re missing one big piece of the puzzle how affordable they actually are Expect to hear pricing in the coming weeks If you re looking for bigger specs and prices possibly TCL is teasing more series news at MWC in Barcelona later this year Follow all of the latest news from CES right here	2022-01-04 14:00:51
海外TECH	Engadget	Seoul Robotics' autonomous 'Control Tower' remotely manages self-driving vehicle fleets	https://www.engadget.com/the-level-5-control-tower-is-a-puppet-master-for-autonomous-vehicle-fleets-140041909.html?src=rss	Seoul Robotics x autonomous x Control Tower x remotely manages self driving vehicle fleetsDespite Tesla s ambitious claims of its vehicles Full Self Driving capabilities today s autonomous navigation technology generally tops out at Level More advanced self driving systems are in development but likely still years away from being safe and cost effective enough for everyday use Seoul Robotics however has developed a mesh network that reportedly imparts Level autonomy to vehicle fleets if only for the quot last mile quot The company s Level Control Tower system sidesteps some technical challenges of self driving technology by embedding sensors in the surrounding infrastructure ーtraffic lights nearby buildings freeway overpasses etc ーrather than on the vehicles themselves Instead of each vehicle looking out for itself and responding autonomously to surrounding traffic the Level Control Tower uses its meshed sensor network to collect data on the overall traffic situation and automate vehicles in the area accordingly using VX communications and G radios Seoul Robotics“Ultimately these systems will be deployed in additional public and business settings powering aspects of our everyday lives such as autonomously navigated parking and public transit quot HanBin Lee CEO of Seoul Robotics said in a prepared statement Tuesday Eventually the technology could find its way to a number of commercial applications from vehicle distribution centers to car rental lots nbsp BMW is currently trialling the system to manage fleet logistics at its manufacturing facility in Munich That system utilizes Seoul Robotics SENSR software and a network of hundreds of LiDAR sensors embedded around the facility to autonomously move newly constructed vehicles across the factory floor Because the system has vantage points from virtually every angle rather than the half dozen or so sensors on the vehicle itself Control Tower can easily guide individual vehicles around blind spots and through cross traffic ーeven while simultaneously quot driving quot hundreds of other automotive drones nbsp	2022-01-04 14:00:41
海外TECH	CodeProject Latest Articles	Microsoft Graph Authentication in Python	https://www.codeproject.com/Articles/5318952/Microsoft-Graph-Authentication-in-Python	graph	2022-01-04 14:52:00
海外科学	NYT > Science	How and Where to Watch the Quadrantid Meteor Shower and More That Peak in 2022	https://www.nytimes.com/article/meteor-showers-2022.html	meteor	2022-01-04 14:10:34
ニュース	BBC News - Home	We can't jab world every four to six months - scientist	https://www.bbc.co.uk/news/uk-59865108?at_medium=RSS&at_campaign=KARANGA	andrew	2022-01-04 14:34:30
ニュース	BBC News - Home	Covid: More hospital trusts declare 'critical incident' over staff shortages	https://www.bbc.co.uk/news/uk-england-59866650?at_medium=RSS&at_campaign=KARANGA	shortages	2022-01-04 14:25:47
ニュース	BBC News - Home	550,000 demand removal of Sir Tony Blair's knighthood	https://www.bbc.co.uk/news/uk-politics-59866084?at_medium=RSS&at_campaign=KARANGA	starmer	2022-01-04 14:48:45
ニュース	BBC News - Home	Lukaku returns to Chelsea squad for cup semi-final	https://www.bbc.co.uk/sport/football/59867343?at_medium=RSS&at_campaign=KARANGA	Lukaku returns to Chelsea squad for cup semi finalRomelu Lukaku has apologised for interview comments and will return to the Chelsea squad for Wednesday s Carabao Cup semi final first leg against Tottenham manager Thomas Tuchel says	2022-01-04 14:39:29
ニュース	BBC News - Home	Southampton set for takeover backed by Serbian media mogul Solak	https://www.bbc.co.uk/sport/football/59866024?at_medium=RSS&at_campaign=KARANGA	dragan	2022-01-04 14:03:44
北海道	北海道新聞	ＮＹ円、１１６円前半	https://www.hokkaido-np.co.jp/article/630048/	外国為替市場	2022-01-04 23:10:00