投稿時間:2021-06-21 01:46:06 RSSフィード2021-06-21 01:00 分まとめ(57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
IT	気になる、記になる…	Amazon プライムデー、｢AirPods Pro｣の整備済み品のセール対象に − 23,400円で販売中	https://taisy0.com/2021/06/21/142119.html	iphone	2021-06-20 15:33:32
IT	気になる、記になる…	Apple、｢Apple Watch｣のチャレンジ企画｢ヨガの日 チャレンジ｣を開催中（本日限り）	https://taisy0.com/2021/06/21/142117.html	apple	2021-06-20 15:25:48
IT	気になる、記になる…	ベルキン、Appleの｢探す｣ネットワークに対応したワイヤレスイヤホン｢SOUNDFORAM Freedom｣を発売（15%オフセール開催中）	https://taisy0.com/2021/06/21/142115.html	apple	2021-06-20 15:24:12
IT	気になる、記になる…	Amazon プライムデー、｢AirPods Pro｣が21％オフの過去最安値に	https://taisy0.com/2021/06/21/142112.html	airpod	2021-06-20 15:14:48
IT	気になる、記になる…	Amazon プライムデー、｢Kindle｣・｢Echo｣・｢Fire｣シリーズが最大70％オフに	https://taisy0.com/2021/06/21/142110.html	amazon	2021-06-20 15:08:39
IT	気になる、記になる…	Caseology、｢Amazon プライムデー｣において人気商品を最大50％オフで販売するセールを開催中	https://taisy0.com/2021/06/21/142107.html	amazon	2021-06-20 15:00:21
IT	気になる、記になる…	OWC、｢Amazon プライムデー｣の特選タイムセールに多数の製品を出品中	https://taisy0.com/2021/06/21/142103.html	amazon	2021-06-20 15:00:18
IT	気になる、記になる…	AUKEY、｢Amazon プライムデー｣において一部製品が最大30％オフになるクーポンを配布中	https://taisy0.com/2021/06/21/142100.html	amazon	2021-06-20 15:00:16
IT	気になる、記になる…	Spigen、｢Amazon プライムデー｣において全商品を最大50％オフで販売するセールを開催中	https://taisy0.com/2021/06/21/142096.html	amazon	2021-06-20 15:00:13
IT	気になる、記になる…	Anker、｢Amazon プライムデー｣において170以上の製品を最大50％オフで販売するセールを開催中	https://taisy0.com/2021/06/21/142068.html	nebulacapsul	2021-06-20 15:00:11
IT	気になる、記になる…	Amazon、年に一度のビッグセール｢プライムデー｣をスタート	https://taisy0.com/2021/06/21/142066.html	amazon	2021-06-20 15:00:09
TECH	Engadget Japanese	プライムデーで6400円OFF！AirPods Proレビュー、やわらかフィットで感動のノイズキャンセリング体験	https://japanese.engadget.com/jp-2019-10-29-airpods-pro-155142701.html	offairpodspro	2021-06-20 15:51:42
TECH	Engadget Japanese	Core i仕様のMacBook Pro 13がセール価格で販売中：Amazonプライムデー	https://japanese.engadget.com/macbook-pro-154954595.html	amazon	2021-06-20 15:49:54
TECH	Engadget Japanese	プライムデーで44％オフ、Fire HD 10＋純正キーボードカバーレビュー	https://japanese.engadget.com/fire-hd-10-013037684-154531006.html	firehd	2021-06-20 15:45:31
TECH	Engadget Japanese	MacBook Air 13（USキーボード）がセール価格で販売中：Amazonプライムデー	https://japanese.engadget.com/macbook-air-154247685.html	amazon	2021-06-20 15:42:47
TECH	Engadget Japanese	Amazonプライムデーで16％オフも！ Apple Watch Series 6 実機レビュー	https://japanese.engadget.com/apple-watch-series6-se-130016079-130016771.html	applewatchse	2021-06-20 15:39:10
TECH	Engadget Japanese	Intel版Mac mini 2モデルが6万7800円からのセール中：Amazonプライムデー	https://japanese.engadget.com/mac-mini-sale-153443687.html	intel	2021-06-20 15:34:43
TECH	Engadget Japanese	プライムデーで67％オフの1980円、球体Echo dotの音質をチェック	https://japanese.engadget.com/echo-083036416-000043863-152902676.html	echodot	2021-06-20 15:29:02
TECH	Engadget Japanese	Amazon Fire HDキッズモデルが最大9380円引きでセール中：Amazonプライムデーデー	https://japanese.engadget.com/fire-hd-kids-152733538.html	amazonfirehd	2021-06-20 15:27:33
TECH	Engadget Japanese	Kindle キッズモデルが5000円オフ。1000冊以上の児童書を1年間読み放題：Amazonプライムデー	https://japanese.engadget.com/primeday-kindle-kids-model-152209952.html	amazon	2021-06-20 15:22:09
TECH	Engadget Japanese	Fire HD 10が9980円からのセール中。キーボードセットはさらにオトク：Amazonプライムデー	https://japanese.engadget.com/fire-hd-10-152124532.html	amazon	2021-06-20 15:21:24
TECH	Engadget Japanese	「Kindle Unlimited」3ヵ月分付きのKindle端末が最大7000円オフ：Amazonプライムデー	https://japanese.engadget.com/kindle-unlimited-bundle-151646491.html	amazon	2021-06-20 15:16:46
TECH	Engadget Japanese	携帯に便利なFire HD 8インチモデルが5680円にてセール中：Amazonプライムデー	https://japanese.engadget.com/fire-hd-8-151333075.html	amazon	2021-06-20 15:13:33
TECH	Engadget Japanese	Kindleシリーズの端末が最大8000円オフ。PaperwhiteやOasisなど全3モデル：Amazonプライムデー	https://japanese.engadget.com/primeday-kindle-150909746.html	amazon	2021-06-20 15:09:09
python	Pythonタグが付けられた新着投稿 - Qiita	ABC206 B, C, D by Python3	https://qiita.com/snhrhdt/items/da1a226d78df38e85a1e		2021-06-21 00:40:13
python	Pythonタグが付けられた新着投稿 - Qiita	【Python】pycryptodomeでAES暗号化/復号化	https://qiita.com/dbc_spr/items/8bb7a0f3d0833e4bd1a1	【Python】pycryptodomeでAES暗号化復号化はじめに下記の記事を参考にAES暗号化復号化を試みたのですが年月現在pycryptoはサポートされておらず、pycryptoからフォークしたライブラリであるpycryptodomeの使用が推奨されていました。	2021-06-21 00:38:46
python	Pythonタグが付けられた新着投稿 - Qiita	深さ優先探索（DFS）をとっても簡単に説明してみる	https://qiita.com/myumura/items/141dafed1f34b03413f9	の問題と同じように考えると、例えばAiBiがだった場合、roadと表すことができます。	2021-06-21 00:30:00
js	JavaScriptタグが付けられた新着投稿 - Qiita	Alpine.js 5分で説明するよ	https://qiita.com/kohashi/items/ae8b1186567ec34b2a75	以前はこのようなケースではVuejsが選ばれることが多かったように思いますが、Vueよりもシンプルながらよい作りのAlpineがより適してるでしょう。	2021-06-21 00:53:04
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	auth-nextでリダイレクトされない	https://teratail.com/questions/345148?rss=all	お力をお貸しいただきたいですmm現在、laravelのauthとnuxtのauthnextでjwt認証を使用して、ログインは成功しているnbspログイン機能は実装できている認識です。	2021-06-21 00:46:28
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	JSON形式のデータから特定の値を取り出したい	https://teratail.com/questions/345147?rss=all	JSON形式のデータから特定の値を取り出したい前提・実現したいことJSON形式のデータから、JavaScriptで特定の値をもったデータを取り出したいのですが、その方法がわかりません。	2021-06-21 00:29:14
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	avatar画像を保存することができません。	https://teratail.com/questions/345146?rss=all	avatar画像を保存することができません。	2021-06-21 00:24:27
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	PhotonのRPC内でPhotonNetwork.Instantiateしたオブジェクトのparent設定の同期ができない	https://teratail.com/questions/345145?rss=all	PhotonのRPC内でPhotonNetworkInstantiateしたオブジェクトのparent設定の同期ができないやりたいことPhotonでルームに入室後、全プレイヤーに送信するRPCメソッド内においてPhotonNetworkInstantiateで生成したオブジェクトのparentを設定し、それを他のルーム内にいるプレイヤーの画面上でも同じ親子関係になるようにしたい。	2021-06-21 00:20:23
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	Pythonのクラス変数の問題	https://teratail.com/questions/345144?rss=all	Pythonのクラス変数の問題以下の問題の答えが何故そうなるか分からないので教えて下さい。	2021-06-21 00:15:02
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	HTML5、videoタグでsrcが中途半端に読み込まれるのを検知するには？	https://teratail.com/questions/345143?rss=all	HTML、videoタグでsrcが中途半端に読み込まれるのを検知するにはGatsbyjsでサイトを作成中。	2021-06-21 00:11:05
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	ジャンプが機能しなくなった	https://teratail.com/questions/345142?rss=all	ジャンプが機能しなくなったジャンプ機能は出来ていたんですが、FreezeRotationとFreezePositionの切り替えの実装が完了したらジャンプが出来なくなりました。	2021-06-21 00:06:45
Azure	Azureタグが付けられた新着投稿 - Qiita	【Microsoft Azure AI Fundamentals】に1週間で合格した話	https://qiita.com/ho__ki/items/fc774739a3c72b496b76	ちょっとここらで今まで触れてこなかったAzureの資格にも手を伸ばしてみようと思い、今回、AIMicrosoftAzureAIFundamentalsに合格したので、その記録を残しておこうと思います。	2021-06-21 00:24:50
Ruby	Railsタグが付けられた新着投稿 - Qiita	【Rails】devise_token_authのUnpermitted parameter: :registrationの対処法	https://qiita.com/GalaxyNeko/items/0962a759e23b2bc55e21	registorationが登録されていないようです。	2021-06-21 00:26:45
海外TECH	DEV Community	Phaser.io Game Development (Learning Phaser.io in 2 weeks). Making a platformer game.	https://dev.to/fradar/phaser-io-game-development-learning-phaser-io-in-2-weeks-making-a-platformer-game-ghn	Phaser io Game Development Learning Phaser io in weeks Making a platformer game I have been learning phaser io game development for the past weeks My goal is to make a full fledged platformer game in phaser only Here is a sneak peek of how it will look like Here is the full collection of all my phaser io games tests If you have any tips about phaser please tell me about in the comments	2021-06-20 15:51:43
海外TECH	DEV Community	WASD knight | A 2d sidescroller rage game.	https://dev.to/fradar/wasd-knight-a-2d-sidescroller-rage-game-12lo	WASD knight A d sidescroller rage game A D rage game I dare you to take up the challenge to finish it HOW TO PLAY Movement W Up A Left D Right S Down Blocks Walls grey Walls are solid blocks that you cannot go through Water blue Water slows you down Lava red Lava will kill you if you touch it Portal blue purple The portal will end the game if you touch it you win Enemies Green Slime A green slime moves back and forth and will kill you if you touch it Red Slime A red slime does not kill you but it will stretch to push you Summoned A summoned will slowly move up and down many blocks and will kill you if you touch it P S This is not my best work Try it here Like my games Wanna see more Follow me here	2021-06-20 15:33:06
海外TECH	DEV Community	Kubernetes Cluster Autoscaler With IRSA	https://dev.to/awscommunity-asean/kubernetes-cluster-autoscaler-with-irsa-3bg5	Kubernetes Cluster Autoscaler With IRSATL DR IRSA is IAM Role for service account This post shows you how to deploy Cluster Autoscaler as a deployment and assign IRSA for it to provide proper permissions Why do we need The Kubernetes Cluster Autoscaler The Kubernetes Cluster Autoscaler CA is a popular Cluster Autoscaling solution maintained by SIG Autoscaling While the HPA and VPA allow you to scale pods CA is responsible for ensuring that your cluster has enough nodes to schedule your pods without wasting resources It watches for pods that fail to schedule and for nodes that are underutilized It then simulates the addition or removal of nodes before applying the change to your cluster The AWS Cloud Provider implementation within Cluster Autoscaler controls the DesiredReplicas field of your EC Auto Scaling Groups What s In This DocumentWhat is Cluster AutoscalerApply cluster autoscaler deployment in kube systemCreate IAM role for service accountAnnotate the EKS service account Restart the cluster autoscaler pod to take effectUndestand some Parameters in AutoscalerBasic Test the cluster autoscalerConclusion What is Cluster AutoscalerCluster Autoscaler is a tool that automatically adjusts the size of the Kubernetes cluster when one of the following conditions is true There are pods that failed to run in the cluster due to insufficient resources Whenever this occurs the Cluster Autoscaler will update the Amazon EC Auto Scaling group to increase the desired count resulting in additional nodes in the cluster There are nodes in the cluster that have been underutilized for an extended period of time and their pods can be placed on other existing nodes Cluster Autoscaler will then decrease the desired count for the Auto Scaling group to scale in the number of nodes Apply cluster autoscaler deployment in kube systemOn AWS Cluster Autoscaler utilizes Amazon EC Auto Scaling Groups to manage node groups Cluster Autoscaler typically runs as a Deployment in your cluster Download cluster autoscaler autodiscover yaml file to update the command point to your EKS cluster and customize expected parameters such as Optimizing for Cost and Availability Prevent Scale Down Evictionwget Edit the cluster autoscaler container command to replace including lt gt with your cluster s name and add the following options balance similar node groups skip nodes with system pods falseHow to run a cluster with nodes in multiples zones for HA The flag balance similar node groups is intended to support this use caseskip nodes with system pods If true cluster autoscaler will never delete nodes with pods from kube system except for DaemonSet or mirror pods we should avoid this for cost optimization Check the files at some important fieldsServiceAccountVersion of cluster autoscaler cluster autoscaler v Command command cluster autoscaler v stderrthreshold info cloud provider aws skip nodes with local storage false expander least waste node group auto discovery asg tag ks io cluster autoscaler enabled ks io cluster autoscaler sel eks dev balance similar node groups skip nodes with system pods falseThen we apply the yaml file and move to next step to create IRSA IAM Role for service account for the autoscaler deployment kubectl get pod n kube system grep autoscalercluster autoscaler f cwdb Running dh Create IAM role for service accountPre requisite EKS cluster with OpenID connect IAM identity provider Ref to Using IAM Service Account Instead Of Instance Profile For EKS Pods for how to Cluster Autoscaler requires the ability to examine and modify EC Auto Scaling Groups We recommend using IAM roles for Service Accounts to associate the Service Account that the Cluster Autoscaler Deployment runs as with an IAM role that is able to perform these functions First create the IAM role which is federated by IAM identiy provider and assumed by sts AssumeRoleWithWebIdentity then attach policy to provide permission of autoscaling group for the role Brief of CDK code in python iam oic is the stack of creating IAM identity provider which is used OIDC as provider open id connect provider arn is its attribute from the stack sel eks oic autoscaler sa autoscaler role iam Role self AutoScalerRole role name sel eks oic autoscaler sa assumed by iam FederatedPrincipal federated f iam oic open id connect provider arn conditions StringEquals string like kube system cluster autoscaler assume role action sts AssumeRoleWithWebIdentity asg statement iam PolicyStatement effect iam Effect ALLOW actions autoscaling DescribeAutoScalingGroups autoscaling DescribeAutoScalingInstances autoscaling DescribeLaunchConfigurations autoscaling DescribeTags autoscaling SetDesiredCapacity autoscaling TerminateInstanceInAutoScalingGroup ec DescribeLaunchTemplateVersions resources conditions StringEquals aws RequestedRegion ap northeast autoscaler role add to policy asg statement Trust relationships looks like Version Statement Effect Allow Principal Federated arn aws iam oidc provider oidc eks ap northeast amazonaws com id lt OIDC PROVIDER ID gt Action sts AssumeRoleWithWebIdentity Condition StringEquals oidc eks ap northeast amazonaws com id lt OIDC PROVIDER ID gt sub system serviceaccount kube system cluster autoscaler oidc eks ap northeast amazonaws com id lt OIDC PROVIDER ID gt aud sts amazonaws com Next step we annotate the EKS service account cluster autoscaler with this role Annotate the EKS service accountRun the kubectl commandkubectl annotate serviceaccounts n kube system cluster autoscaler eks amazonaws com role arn lt IAM role arn which created above gt Check the SA kubectl describe sa cluster autoscaler n kube systemName cluster autoscalerNamespace kube systemLabels ks addon cluster autoscaler addons ks io ks app cluster autoscalerAnnotations eks amazonaws com role arn arn aws iam role sel eks oic autoscaler sa kubectl kubernetes io last applied configuration apiVersion v kind ServiceAccount metadata annotations labels ks addon cluster autoscaler addons ks io ks app Image pull secrets lt none gt Mountable secrets cluster autoscaler token xxxxxTokens cluster autoscaler token xxxxxEvents lt none gt Restart the cluster autoscaler pod to take effect kubectl rollout restart deploy cluster autoscaler n kube systemdeployment apps cluster autoscaler restarted We ve done setting up the cluster autoscaler but we need to understand some parameters in autoscaler for better choices of Scalability performance availability and cost optimization Undestand some Parameters in Autoscaler Spot instance Save up to off the on demand price with the trade off the Spot Instances can be interrupted at any time when EC needs the capacity back To solve that we should select as many instance families as possible eg M M Ma and Mn instances all have similar amounts of CPU and Memory The strategy expander least waste is a good general purpose default and if you re going to use multiple node groups for Spot Instance diversification Read more Expanders Prevent Scale Down Eviction Some workloads are expensive to evict such as schedule running reports cronjob to clear caches or doing backup The Cluster Autoscaler will attempt to scale down any node under the scale down utilization threshold which will interrupt any remaining pods on the node This can be prevented by ensuring that pods that are expensive to evict are protected by a label recognized by the Cluster Autoscaler Ensure that Expensive to evict pods have the annotation cluster autoscaler kubernetes io safe to evict false EBS Volumes stateful applications such as database or cache which need high availability if sharded across multiple AZs using a separate EBS Volume for each AZ Ensure that Node group balancing is enabled by setting balance similar node groups true Node Groups are configured with identical settings except for different availability zones and EBS Volumes Basic Test the cluster autoscaler Cluster Autoscaler will respect the minimum and maximum values of each Auto Scaling Group It will only adjust the desired value Cluster Autoscaler will attempt to determine the CPU memory and GPU resources provided by an Auto Scaling Group based on the instance type specified in its Launch Configuration or Launch Template It will also examine any overrides provided in an ASG s Mixed Instances Policy If any such overrides are found only the first instance type found will be used In my cluster I setup the node groud capacity with max size min size and desized size combine with instance types family type which ensure the usage of CPU and MEM ra xlarge and r xlarge add nodegroup capacity eks cluster add nodegroup capacity id SelEksNodeGroup capacity type eks CapacityType SPOT desired size disk size instance types ec InstanceType ra xlarge ec InstanceType r xlarge labels role worker type stateless max size min size nodegroup name sel eks node group node role worker role subnets ec SubnetSelection subnet type ec SubnetType PRIVATE Test scaleup node When scaling out all services by setting their replicas gt the cluster autoscaler detects the need of more node to add more worker See its log I scale up go Pod dev stream bbd xjnqk is unschedulable I scale up go Pod dev index bbc zgwh is unschedulable I scale up go Pod dev app dfbf ptfpr is unschedulable I scale up go Pod dev nginx bbbf tgs is unschedulable I scale up go Pod dev react index sink f dtjg is unschedulable I scale up go Upcoming nodes I waste go Expanding Node Group eks bcedd ade ca yyyy xxxxxxxx would waste CPU Memory Blended I scale up go Best option to resize eks bcedd ade ca yyyy xxxxxxxx I scale up go Estimated nodes needed in eks bcedd ade ca yyyy xxxxxxxx I scale up go Final scale up plan eks bcedd ade ca yyyy xxxxxxxx amp gt max I scale up go Scale up setting group eks bcedd ade ca yyyy xxxxxxxx size to I auto scaling groups go Setting asg eks bcedd ade ca yyyy xxxxxxxx size to Test scale down node by scaling down all services CA will gradually check the cluster and then scaledown the node by set the node to SchedulingDisabled and update auto scaling group See the logs I scale down go Node ip ap northeast compute internal cpu utilization I static autoscaler go ip ap northeast compute internal is unneeded since UTC m duration ms I scale down go ip ap northeast compute internal was unneeded for ms I scale down go Scale down removing empty node ip ap northeast compute internal I event go Event v ObjectReference Kind ConfigMap Namespace kube system Name cluster autoscaler status UID fd d caa aa xxxxxxxx APIVersion v ResourceVersion FieldPath type Normal reason ScaleDownEmpty Scale down removing empty node ip ap northeast compute internal I delete go Successfully added ToBeDeletedTaint on node ip ap northeast compute internal I auto scaling groups go Terminating EC instance i ddfacf I aws manager go Some ASG instances might have been deleted forcing ASG list refresh I auto scaling groups go Regenerating instance to ASG map for ASGs eks bcedd ade ca yyyy xxxxxxxx I event go Event v ObjectReference Kind ConfigMap Namespace kube system Name cluster autoscaler status UID fd d caa aa xxxxxxxx APIVersion v ResourceVersion FieldPath type Normal reason ScaleDownEmpty Scale down empty node ip ap northeast compute internal removed I event go Event v ObjectReference Kind Node Namespace Name ip ap northeast compute internal UID efbc dd dac c aeccecde APIVersion v ResourceVersion FieldPath type Normal reason ScaleDown node removed by cluster autoscaler I pre filtering processor go Skipping ip ap northeast compute internal node group min size reached I pre filtering processor go Skipping ip ap northeast compute internal node group min size reached I node tree go Removed node ip ap northeast compute internal in group ap northeast x ap northeast b from NodeTreeCheck the fleet for canceling the spot instance after scaling down How to remove spot instance from cluster manuallySome time cluster autoscaler cannot scale down the node due to eg I cluster go Fast evaluation node ip ap northeast compute internal cannot be removed non daemonset non mirrored non pdb assigned kube system pod present aws load balancer controller ccf dhTo scaledown the node we can cordon the node and rollout restart all deployment daemonset assign on the node then let the cluster autoscaler scaledonw the node If you would like to replace a spot instance flowing reference will help spot ConclusionUsing Cluster Autoscaler is the best practice in your EKS cluster one of the most benifit is COST Refs Blog · Github · stackoverflow · Linkedin · Group · Page · Twitter	2021-06-20 15:23:14
海外TECH	DEV Community	7 Awesome GitHub Repositories for JavaScript developers. A Thread 👇	https://dev.to/manitej/7-awesome-github-repositories-for-javascript-developers-a-thread-1nkk	Awesome GitHub Repositories for JavaScript developers A Thread Insha insharamin Awesome GitHub Repositories for JavaScript developers A Thread PM Jun Insha insharamin ️⃣JavaScriptThis repository is a collection of awesome JavaScript vanilla projects created by Wes Bos Build things in days and enhance your JavaScript skills PM Jun Insha insharamin ️⃣wtfjsA list of funny and tricky JavaScript examples If you are a beginner you can use these notes to get a deeper dive into JavaScript PM Jun Insha insharamin ️⃣front end interview handbookAlmost complete answers to Front end Job Interview Questions which you can use to interview potential candidates test yourself Go from zero to front end interview hero with this handbook PM Jun Insha insharamin ️⃣javascript questionsA long list of advanced JavaScript questions and their explanations PM Jun Insha insharamin ️⃣es cheatsheetThis repository contains ES cheat sheet containing tips tricks best practices and code snippets PM Jun Insha insharamin ️⃣ js conceptsThis repository was created with the intention of helping developers master their concepts in JavaScript JavaScript concepts every developer should know PM Jun this article is generated using	2021-06-20 15:13:51
海外TECH	DEV Community	Beginner JavaScript - 8 - Strings	https://dev.to/thenerdydev/beginner-javascript-8-strings-2788	Beginner JavaScript StringsHey everyone In this article let us discuss about the Strings in JavaScript This is the eighth part of my Beginner JavaScript Series on Dev Strings in JavaScript A complete pictureIn JavaScript the textual data stored in form of a series of characters is known as a string Here in JavaScript we don t have a separate type for a single character For example if you have a sentence then that sentence is a series of characters so in the programming language it is referred as a string of characters A word itself is a string as well because it is composed of several characters like cricket javascript etc Let us now see how we can define strings using different types of quotes So we can use three types of quotes to define strings Single Quotes Double Quotes Backticks So let us see an example String in single quotes const wordInSingleQuotes This is some string String in double quotes const wordInDoubleQuotes This is string enclosed in double quotes const name Alex String in template strings backticks const wishMe Good morning name interpolating name using template strings syntax console log wishMe logs Good morning Alex Getting the length of stringsIn JavaScript to get the length of the string we can make use of the length property Let us see an example for same const someVariable JavaScript is my favorite programming language console log someVariable length Accessing charactersTo extract a character at some position say position use square brace notation like this position As an alternative we can also call the charAt method to extract a character sitting at some specific position Note The first character starts from the zero position Let us see an example to understand how we can access characters in JavaScript const hello Hello JavaScript Using the square brace notation indexing console log The first character of our string is hello H Using the charAt method to get the first character of our string console log hello charAt H Using the charAt method to get the last character of our string console log hello charAt hello length t Iterating over characters using for ofconst hello Hello JavaScript for let character of hello console log character The Immutability of StringsStrings can t be changed mutated in JavaScript It is impossible to change a character though you can definitely access it but you cannot set it to some other value const hello Hello JavaScript hello h does not workconsole log hello H does not work Let us see a couple of other methods in action const day Monday Change the string to lowercase completely console log day toLowerCase monday Change the string to uppercase completely console log day toUpperCase MONDAY To find the index of a character in the string we can make use of the indexOf method If the character that we looking for does exists in the string then we get the index for it else we get const channelName the nerdy dev console log channelName indexOf t console log channelName indexOf O So this is it for this one If you want to learn about Strings check out my video where I talk about Strings If you are looking to learn Web Development I have curated a FREE course for you on my YouTube Channel check the below article Web Developer Full Course HTML CSS JavaScript Node js and MongoDB The Nerdy Dev・Apr ・ min read html css node javascript Looking to learn React js with one Full Project check this out Learn React with one BIG Project NOTES included Demo and Video Link The Nerdy Dev・Jun ・ min read daysofcode javascript react webdev Follow me on Twitter Check out my YouTube Channel	2021-06-20 15:06:50
海外TECH	Engadget	AirPods Pro are on sale for $190 ahead of Prime Day	https://www.engadget.com/apple-airpods-pro-sale-june-2021-151050367.html?src=rss_b2c	prime	2021-06-20 15:10:50
海外科学	NYT > Science	Wondering if the Vaccine Worked? Get the Right Test, at the Right Time	https://www.nytimes.com/2021/06/20/health/coronavirus-vaccine-antibody-test.html	timescientists	2021-06-20 15:03:09
ニュース	BBC News - Home	Andy Burnham's anger at Manchester-Scotland travel ban	https://www.bbc.co.uk/news/uk-england-manchester-57544665	government	2021-06-20 15:48:15
ニュース	BBC News - Home	Max Verstappen wins intense French Grand Prix battle with Lewis Hamilton	https://www.bbc.co.uk/sport/formula1/57545961	Max Verstappen wins intense French Grand Prix battle with Lewis HamiltonMax Verstappen fights back to pass Lewis Hamilton and take a brilliant win in the French Grand Prix to extend his championship lead	2021-06-20 15:24:37
ニュース	BBC News - Home	McDonald's to hire 20,000 staff and open 50 outlets	https://www.bbc.co.uk/news/business-57544235	telegraph	2021-06-20 15:42:35
ニュース	BBC News - Home	Queen's: Cameron Norrie loses final to Matteo Berrettini	https://www.bbc.co.uk/sport/tennis/57545917	queen	2021-06-20 15:14:19
ニュース	BBC News - Home	Queen's 2021: Matteo Berrettini beats GB's Cameron Norrie in Queen's Club final	https://www.bbc.co.uk/sport/av/tennis/57547621	Queen x s Matteo Berrettini beats GB x s Cameron Norrie in Queen x s Club finalWatch highlights as Italy s Matteo Berrettini becomes the first player to win Queen s on debut since Boris Becker in beating Great Britain s Cameron Norrie	2021-06-20 15:42:47
ニュース	BBC News - Home	Covid-19 in the UK: How many coronavirus cases are there in my area?	https://www.bbc.co.uk/news/uk-51768274	cases	2021-06-20 15:22:48
LifeHuck	ライフハッカー［日本版］	【Amazonプライムデーがスタート】Fire TV Stick 4Kが43%オフの3,980円、AirPods Proが21%オフとお買い得	https://www.lifehacker.jp/2021/06/amazon-primeday-2021-beginning.html	airpodspro	2021-06-21 00:45:00
LifeHuck	ライフハッカー［日本版］	Apple Watchが1万円台〜【Amazonプライムデー】で買いたい！家電・ガジェット系 目玉アイテム（更新中）	https://www.lifehacker.jp/2021/06/237033amazon-primeday-spot.html	amazon	2021-06-21 00:30:00
サブカルネタ	ラーブロ	21/175　真ごころラーメン　竹：にぼしラーメンセット（130gメンと半チャーハン）、味付たまご	http://feedproxy.google.com/~r/rablo/~3/jWtvdL2NrMg/single_feed.php	真ごころ	2021-06-20 16:15:50
北海道	北海道新聞	アイヌ民族学ぶ　タイでイベント	https://www.hokkaido-np.co.jp/article/557767/	日本文化センター	2021-06-21 00:15:00
北海道	北海道新聞	１．８万人滞在　発熱外来棟も設置　東京五輪・パラ　選手村を公開	https://www.hokkaido-np.co.jp/article/557763/	世界各国	2021-06-21 00:13:21
北海道	北海道新聞	ソ１―１日（２０日）　２戦連続で引き分け	https://www.hokkaido-np.co.jp/article/557701/	引き分け	2021-06-21 00:10:04
北海道	北海道新聞	道内きょうからまん延防止に移行　酒提供、札幌午後７時まで　９市町村は午後８時	https://www.hokkaido-np.co.jp/article/557741/	新型コロナウイルス	2021-06-21 00:08:08