投稿時間:2022-04-08 15:20:57 RSSフィード2022-04-08 15:00 分まとめ(25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	ITmedia 総合記事一覧	[ITmedia ビジネスオンライン] 東京・銀座に高級旅館「ふふ東京銀座」　全客室にテラス、天然温泉を用意	https://www.itmedia.co.jp/business/articles/2204/08/news136.html	itmedia	2022-04-08 14:17:00
IT	ITmedia 総合記事一覧	[ITmedia News] 急激にストリーミングにシフトした日本の音楽産業の「これから」を統計から考察する	https://www.itmedia.co.jp/news/articles/2204/08/news133.html	itmedia	2022-04-08 14:15:00
IT	ITmedia 総合記事一覧	[ITmedia PC USER] サードウェーブ、GeForce RTX 3090 Ti搭載ゲーミングデスクトップPC　4月22日に受注開始	https://www.itmedia.co.jp/pcuser/articles/2204/08/news132.html	galleria	2022-04-08 14:12:00
TECH	Techable（テッカブル）	パーソナルスタイリングの「DROBE」、AIと10万超のデータ活用で高ニーズの商品開発開始	https://techable.jp/archives/176748	drobe	2022-04-08 05:00:37
IT	情報システムリーダーのためのIT情報専門サイト IT Leaders	青森県立中央病院、Web会議を利用したオンライン面会システムを稼働 | IT Leaders	https://it.impress.co.jp/articles/-/22979	青森県立中央病院、Web会議を利用したオンライン面会システムを稼働ITLeaders青森県立中央病院青森県青森市は、Web会議を利用したオンライン面会システムを年月に稼働開始した。	2022-04-08 14:19:00
AWS	AWS Japan Blog	「クラウドによる経済成長の実現」に関するホワイトペーパーの公表	https://aws.amazon.com/jp/blogs/news/growing-on-cloud/	公共政策	2022-04-08 05:20:52
python	Pythonタグが付けられた新着投稿 - Qiita	LINE Messaging APIとPython FastAPIでメッセージ応答Botを作る	https://qiita.com/KoSunOQ/items/50a4950082d268694668	linebot	2022-04-08 14:47:20
python	Pythonタグが付けられた新着投稿 - Qiita	広告でよく見る試験管パズルゲームをプログラムで解いてみた	https://qiita.com/persimmon-persimmon/items/3988a1bbc3fd1821df56	暇つぶし	2022-04-08 14:30:26
Git	Gitタグが付けられた新着投稿 - Qiita	gitlabをリバースプロキシ下で運用する場合のURL問題の解決	https://qiita.com/Yothuba3/items/676c5fa7d1114a82b719	gitlab	2022-04-08 14:55:29
海外TECH	DEV Community	Solidity Programming language tutorial	https://dev.to/dumboprogrammer/solidity-programming-language-tutorial-1e4d	Solidity Programming language tutorialSolidity is a strongly typed high level programming language for writing ethereum based smart contracts Solidity code runs on Ethereum Virtual Machine EVM EVM s are run time environments for running contract code in the Ethereum platform A smart contract is a collection of contract functions and it s data state that is stored in ethereum blockchain network Before starting I do expect you to have some basic OOP knowledge Solidity Advantages Object oriented language that classes and inheritance Hight level language and human readable code Large community support Lot of developer tools available Static type language means every data contains type before storing it Everything is contracted oriented Runs on Ethereum Virtual machineSolidity Disadvantages Once Contract is created adding features to the existing contract is not possible It does not have a floating typeSolidity files have an ending with sol Solidity must have a semicolon at the end Solidity is case sensitive Deploying Solidity PrivateIt uses private Ethereum networks for running contracts and testing the code Public Testnet These are public blockchain Ethereum network for testing contracts and does not use fake fundsPublic Mainnet These are public blockchains Ethereum real production ready which uses real money funds and has access to everyone Variables Each variable you use in solidity must declare of type Like any programming language It is used to store the value in a variable Variables in solidity are used to store the data in blockchain as well as used in functions for processing variables are declared with the type of variable and visibility or access modifier and variable name datatype access modifier variablenameDatatype is an inbuilt or custom user defined data type such as boolean unit access modifier Also called visibility and how and where the variable values are accessible Possible values arepublicprivateinternalexternalvariablename is a valid identifier in solid It contains a combination of alphabets and numeric The reserved keywords are not used variable scopesGlobal Scope State variableLocal VariableGlobal Inbuilt VariableSolidity State variablevariable declared in contract in one of the scopes variable declared in the contract are called state variablesdata is stored permanently in blockchain storage Global variables declaring solidity version must be at the toppragma solidity contract SolidityTest uint stateData State variable constructor public stateData Using State variable Local variables pragma solidity contract VariablesContractTest State variables are declared inside a contract ie global scope uint age State variable constructor public age function add public view returns uint local variables are declared and accessed inside a function uint localVariable local variable uint localVariable local variable uint sum localVariable localVariable local variable return sum access the local variable Global Inbuilt Variable Solidity defines Global scope predefined variables and accessible anywhere contract running in the blockchain It returns the block transaction and account information of the running blockchain node Data Type It allocates memory size based on datatype Value TypesReference TypesSolidity Value TypesBool It is a boolean that contains true false Integer typesIt provides multiple various integer typesSolidity provides multiple types to store signed and unsigned integers singed integers types It uses store positive and negative numbersunsigned integers types It uses store positive numbersSolidity Address Type the address is a type in the solidity that stores blockchain address memory location It contains a byte value The address contains a properties balance and transfersolidity Fixed size byte array typesIt provides multiple byte types bytes bytes …bytes Another type bytes is an alias for bytesAbstracts contracts Abstract contract is an abstract design of an contract and implementation contract provides the implementation to abstract function in it Abstract contracts are contract that have at least one function without implementation abstract Contract are contracts that created with abstract keyword Abstract functions are created with virtual keywordOnce abstract contract is created You need to extend by using is keyword syntax pragma solidity gt lt abstract contract Animal function eat public virtual returns bytes Comments A solidity programming language supports various comments types Single line and inline comments Multiline or block line comments Documentation or natspec comments Single Line single lineMulti Line multi line comment line multi line comment line documentation solidity Natspec comments Every program provides documentation for API Solidity provides special comments syntax for writing documentation comments in the code using Ethereum Natural Specification Natspec syntaxIt provides rich documentation for contract functions classes interfaces using the Doxygen notation format It helps the user to write user and developer documentation These can be included with single or multiple line commentsSingle line comments three double slashes Multiple line comments start with and ends with It contains following tags Once you have the smart contract file we have to run the following with a solidity compilersolc userdoc devdoc Helloworld solsolc is a solidity compiler generated for compiling contracts userdoc generates solidity user documentation devdoc generates solidity developer documentationIt generates User and developer documentation json file If Else Like any programming language Solidity provides most of the control and conditional expressions that are provided by Javascript It does not have support for switch and goto in if the conditional expressionIt provides the following featuresif elseif else ifsyntax pragma solidity contract SolidityTest uint age variable constructor public age function checkAge public view returns string memory if age gt return else return less than return default Interface Interface is an abstract design of an contract and similar to Abstract Contract in Solidity It created using interface keyword Contains function declaration without body Interface functions always ends with semicolon Notes Interface contracts only contains function declaration or header No implementation in function It does not contain a constructorIt is not possible to use local or state Variables in interfaceInterfaces can not be extend by other contracts or interfacesFunctions defined in Abstract without implementation created with virtual keywordIt is not possible with creating an instance of an Interface contracts Function header in interface always end with semicolon syntax pragma solidity gt lt interface Animal function eat public virtual returns bytes While Loops While loop executes the statements multiple times based on condition is truesyntax pragma solidity While loop testcontract whileTest uint i uint result function sum public returns uint data while i lt i result result i return result Constructor constructor is an optional function declared in the contract using the constructor keyword It contains code to change and initialize the state variables It is called automatically once the contract is created and starts executing in the blockchain constructor optional parameters access modifier Notes Constructor declaration is optionalThe contract contain only one constructor declarationOverloading constructor is not supportedif the constructor is not defined the default constructor is used SPDX License Identifier GPL pragma solidity contract ConstructorTest string name constructor public name John function getName public view returns string memory return name Constructs are also used in inheritance hierarchy here pass data in contract inheritance hierarchy Constructor inheritance Order executionLet s declare base contract SPDX License Identifier GPL pragma solidity contract Parent string name constructor string memory name name name Events Events are used to tell font end applications about blockchain actions It contains the information to log into EVM logs These logs are stored as transaction logs in the blockchain Client interfaces apps are notified with event actions Events in solidity used to log the event information to EVM logs Events are cheap than storing data in terms of gas consumption It maintains the history of transaction logs of every change to the transaction in Blockchaindeposit and transfer actions are written as events in the blockchain Events can be created using the event keyword syntax event transfer address indexed from address indexed to uint amount Example contract EventTest Create an transfer event event transfer address indexed from address indexed to uint amount Listen for events Once events are emitted from a contract You can subscribe to catch events in javascript Following is a code to listen and access the events in solidity let contract abi abi json code during contract compilation let EventTest web eth contract contract abi let EventTestContract ClientReceipt at x EventTestContract transfer function err data if err console log data For Looploop a piece of code untill required value acheived syntax for Initialize Conditional Expression updateIteration Code block Functions Functions are reusable code that executes by the compiler Solidity functions execute the code In blockchains syntax function functionname lt visibility specifier gt lt modifier gt returns type return typevalue public public functions are visible from internal and external contracts Can be called inside a contract or outside contract Default is public It is visible to public so security concern private private functions are visible inside the same contract Can be called inside a contract Not able to call from an outside contractinternal Similar to private functions and visible to contract hierarchy Can be called inside a contract and Contracts that inherit from it external external functions are visible to public functions Can be called outside contract only Modifier in functions Modifiers allows you to define the functions with behavior for changing the state of contract data constant Does not change the state of contract functionsRead the state global variablesModification of state is not possibleused for getter of a state variable calling events or functions that modify the state view The view functions display the data functions do not modify the state variable Suggest using for read data operationspure pure functions does not access data from blockchaindoes not allow read or write operationsNo access to state data or transaction datareturn type based on the data from a functionpayable payable functions allows accepting ether from a callerFunction fails if the sender has not provided etherOther functions do not accept ether only payable functions allow Arrays The array is a data structure to store multiple variables values under a single name Array is one of the reference types defined in a solidity programming language Arrays are of two typesFixed array Array created with a fixed size of elements during declaration string stringArray Dynamic array Array created with dynamic size and no fixed size sizestring stringArray Initialing array syntax pragma solidity contract StaticArrayTest string numbers one two three function getNumbers external string memory mynumbers one two three length length of an array push adds an element to a dynamic array It adds an element to the last position of an array pop removes an element from the dynamic array It deletes an element from the last element of an array Enums Enum defines the multiple values and creates the object with one of the values Enum is an enumerable constant in Solidity The user creates a custom type to select one constant from multiple predefined constants Enums are useful to hold the status of transactions status and the flow of small contracts Enum types can be declared using the enum keyword It assigns the index to each constants in enumeration list For example constants constant …constants N Syntax enum enumName constants constant constantsN Once Enum type is declared you can create a variable of a new typeenumName visibile variableName accessing enums Defining contract contract EnumTest enum Number One Two Three Number public number Number Three constructor public function getNumber public view returns Number return number enum to number type Solidity program example for Enum Type declarationpragma solidity Defining contract contract EnumTest enum Number One Two Three Number public number Number Three constructor public function getNumber public view returns uint return uint number enums to string Solidity program example for Enum Type declarationpragma solidity Defining contract contract EnumTest enum Number One Two Three Number public number Number Three constructor public function getNumber public view returns uint return uint number function getNumberName external view returns string memory Number strNumber number if strNumber Number One return One if strNumber Number Two return Two if strNumber Number Three return Three return Structs structs are used to represent the object or classes in java interface and classes in typescript Structs used to combine theSuppose you want to store employee data in Ethereum block and employee contains id name and salary details For example In contracts declare three variables as seen below uint id string name uint salary Intialize struct Employee uint id string name uint salary Declare Employee employee employee Employee john employee Employee john mapping Solidity provides a data structure mapping to store keys and values in a hashtable kind of format It is similar to hashtable in java and Map in javascript and typescript It is a reference type similar to Array and struct In SOlidity It does not support the loop to mapping keys and values mapping keyType gt valueType public mappingVariable Ethers In Solidity We have literal numbers that can be suffixed with units There are different types of unitsEther UnitsTime UnitsEther or Currency UnitsEther Units are currency denominations of an Ether unit The number can be suffixed with Ether Units for denominations Ether units WeiFinneyszaboetherThe smallest Unit is wei which is equal to x power the base unit is EtherThat s it Hope you got the basics of solidity Thanks for reading A like is appreciated	2022-04-08 05:05:33
海外TECH	Engadget	Ford and Lincoln owners can now personalize their Alexa commands	https://www.engadget.com/ford-lincoln-personalize-alexa-commands-055322525.html?src=rss	Ford and Lincoln owners can now personalize their Alexa commandsFord and Lincoln owners whose vehicles have hands free access to Alexa don t have to stick to using standard voice commands if they don t want to The automaker has rolled out enhanced Car Control capabilities and with it comes the option to teach Alexa commands that reflect their natural way of speaking For example they can program in quot Alexa I m cold quot and then teach the voice assistant to respond by asking what course of action it should take such as quot I can increase the temperature by degrees or turn off the AC What should I do quot Another example of a personalized phrase would be quot Alexa set the AC to full blast quot The assistant can then ask the owner what they mean by quot full blast quot Training Alexa to respond to personalized phrases is made possible by the assistant s teachable AI technology All vehicles with Alexa Built in will get access to enhanced Car Control when it becomes available to them At the moment the models with access to the hands free experience are the F Bronco Mustang Mach E Edge the new Expedition Nautilus and newly launched Navigator The long awaited F Lightning will also come with the capability when it launches Ford debuted the hands free Alexa capability for its vehicles last year marking the beginning of its six year partnership with Amazon As part of that partnership it s giving its customers complimentary access to Alexa for up to three years that begin on the new vehicle s warranty start date Ford will demonstrate its enhanced Car Control and Alexa capabilities at the New York International Auto Show from April th through the th	2022-04-08 05:53:22
医療系	医療介護 CBnews	看護師養成所、1日付で3校指定-厚労省公表	https://www.cbnews.jp/news/entry/20220406153143	厚生労働省	2022-04-08 14:30:00
金融	JPX マーケットニュース	[東証]「NEXT FUNDS ロシア株式指数・RTS連動型上場投信」（コード 1324）の売買停止にかかる運用変更について	https://www.jpx.co.jp/news/0060/20220408-01.html	nextfunds	2022-04-08 15:00:00
ニュース	ジェトロ ビジネスニュース（通商弘報）	米ファイザー製の新型コロナ治療薬パクスロビド、医療保険の適用対象に	https://www.jetro.go.jp/biznews/2022/04/f8633d346275651c.html	適用対象	2022-04-08 05:40:00
ニュース	ジェトロ ビジネスニュース（通商弘報）	国土交通部、国際線の日常回復方策を発表、6月から金浦空港の国際線再開へ	https://www.jetro.go.jp/biznews/2022/04/4f7efc301572558a.html	国土交通部	2022-04-08 05:30:00
ニュース	ジェトロ ビジネスニュース（通商弘報）	公共交通機関の利用料金は年内凍結、背景に社会騒乱の苦い記憶	https://www.jetro.go.jp/biznews/2022/04/f2c3b30885cd481b.html	公共交通機関	2022-04-08 05:25:00
ニュース	BBC News - Home	Ashanti: R&B singer's mum reveals 20-year-old souvenir star at Hollywood ceremony	https://www.bbc.co.uk/news/entertainment-arts-61033263?at_medium=RSS&at_campaign=KARANGA	ashanti	2022-04-08 05:29:37
ニュース	BBC News - Home	Why I gave a kidney to a work colleague	https://www.bbc.co.uk/news/uk-scotland-edinburgh-east-fife-60839241?at_medium=RSS&at_campaign=KARANGA	ferguson	2022-04-08 05:54:02
ニュース	BBC News - Home	Man City v Liverpool: Tiny margins involved in Premier League's title-defining rivalry	https://www.bbc.co.uk/sport/football/60980978?at_medium=RSS&at_campaign=KARANGA	Man City v Liverpool Tiny margins involved in Premier League x s title defining rivalryManchester City and Liverpool are involved in another epic title battle we look at the small differences that might help separate them at the end of the season	2022-04-08 05:06:56
ニュース	BBC News - Home	'Flawed' EFL gambling evidence should be ignored - MP	https://www.bbc.co.uk/sport/football/61033156?at_medium=RSS&at_campaign=KARANGA	flawed	2022-04-08 05:04:01
北海道	北海道新聞	東映アニメ、新作放送再開へ　不正アクセスで休止	https://www.hokkaido-np.co.jp/article/667161/	不正アクセス	2022-04-08 14:12:04
IT	週刊アスキー	『機動戦士ガンダム バトルオペレーション2』がSteamに！2022年に配信決定	https://weekly.ascii.jp/elem/000/004/088/4088808/	pcsteam	2022-04-08 14:45:00
IT	週刊アスキー	終末のパラレルワールドを描く新作スマホRPG『Echocalypse -緋紅の神約-』のPVが公開	https://weekly.ascii.jp/elem/000/004/088/4088804/	echocalypse	2022-04-08 14:30:00
IT	週刊アスキー	『ソフィーのアトリエ2』で『テイルズ オブ アライズ』とのコラボアイテムを配信開始＆記念映像も公開！	https://weekly.ascii.jp/elem/000/004/088/4088796/	nintendoswitchpcsteam	2022-04-08 14:05:00
海外TECH	reddit	[Post Game Thread] Angels drop the season opener vs Houston 3-1	https://www.reddit.com/r/angelsbaseball/comments/tyw6w0/post_game_thread_angels_drop_the_season_opener_vs/	Post Game Thread Angels drop the season opener vs Houston submitted by u Thrust bot to r angelsbaseball link comments	2022-04-08 05:21:13