投稿時間:2022-07-03 11:12:43 RSSフィード2022-07-03 11:00 分まとめ(14件)

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AWS	lambdaタグが付けられた新着投稿 - Qiita	Lambdaをコンテナイメージから作る	https://qiita.com/a_b_/items/d9398fd6efe0f66b6c6f	amazon	2022-07-03 10:58:17
python	Pythonタグが付けられた新着投稿 - Qiita	Tenable.io_SDK_for_Pythonでスキャン結果を自動エクスポートする	https://qiita.com/takayuki2022/items/dc77ebdd02e9f65713e6	oswindowspythonxxpython	2022-07-03 10:45:54
AWS	AWSタグが付けられた新着投稿 - Qiita	Lambdaをコンテナイメージから作る	https://qiita.com/a_b_/items/d9398fd6efe0f66b6c6f	amazon	2022-07-03 10:58:17
golang	Goタグが付けられた新着投稿 - Qiita	Goでコマンド作成	https://qiita.com/popo62520908/items/e41c23183b5431723f94	dsfuncmainflagparseargs	2022-07-03 10:16:12
海外TECH	DEV Community	Day 1: A beginners take on JS scope. Var vs Let vs Const.	https://dev.to/nicklane/day-1-a-beginners-take-on-js-scope-var-vs-let-vs-const-511o	Day A beginners take on JS scope Var vs Let vs Const I am a beginner So I have recently begun on my challenge to find a web dev role by the end of the year Along side this goal comes all the new and exciting things you have to learn and one of the things that is incredibly important is understanding ES in all it s glory So what is the difference between Var Let and Const There are a fair few differences and use cases for each and all are important but to properly answer this question you need to understand the concept of scope A brief aside about scope Without getting into too much detail scope is where variables in your code can be accessed or referenced The three types of scope that are important here though are Global Functional and Block scope Block scope is anything that is surrounded by curly braces more specifically an if while for statement might be where this arises let x if gt const y Both of the above are examples of block scope Functional scope or Local Scope in JavaScript they are essentially the same is when you declare your variables inside a function that cannot be accessed outside said function function add x y var z x y return z function subtract x y let z x y return y function multiply x y const z x y return y z cannot be accessed here All of the three types of variable here seem to act the same as they cannot be accessed outside of the functions due to Functional Local scope Last but not least is global scope which as you can imagine can be referenced anywhere your code as it is declared outside a function or block let x x can be accessed herefunction myFunction x x can also be accessed here Now that we understand what scope in JavaScript looks like perhaps we should get back on track Hurry up and tell me how Var Let and Const are different Ok ok Well with the introduction of Let and Const in ES block scoping became a concern and also a benefit to using these keywords Quick Note To declare a variable is to create it with a keyword var x let y To define a variable is to give it a value var x let y const x So in one sentence each var the og variable can be declared and defined as many times as you wish let can be declared a single time but defined as many times as you wish it also has block scoping const can be declared and defined ONLY once but it also has block scoping and MUST be defined and declared at the same time Easy eh And now for the detailsVar is now not the variable you should declare as a default instinct because of it s global scope Scoping is important for good practice code so as your code gets bigger and longer and more complex you might run into some redeclaration problems var x function myFunction var x Do this and that This is ALLOWED but it should be avoided as all costs because it is confusing and generally leads to bad practice Nowadays it is recommended to use the let keyword in var s place Let as mentioned previously has block scope but can be redeclared as many times as you wish let x x x This is ok but let y let y This is NOT okand now for block scope if check something let y console log y Expected console log y Expected undefined Finally const is the most interesting keyword because it has block scoping must be declared and defined at the same time and cannot be redeclared or redefined at any point but it still has so many use cases const should be used when defining arrays and objects because each value inside the array is not in fact a constant but the reference to the const ITSELF is constant Some examples const names Nick Emma Dan names Tim Tom Tam ERROR this is a redefine so will not work const ages const ages ERROR this is a Redeclaration so will not work However using an object and an array as an example these both are ok const names Nick Emma Dan names Not Nick const user name Nick age hobby board games user age All valid code A final note is that const like let is block scoped but I won t bore you with more examples That s all folks This has been me as a beginner attempting to revise and explain briefly what scoping and the three keywords var let and const mean as simply as possible I am sure I ve missed so many interesting points but hey maybe next time For more details read MDN or WSchools as always	2022-07-03 01:27:44
海外ニュース	Japan Times latest articles	KDDI data services restored to 70% of customers in parts of Japan	https://www.japantimes.co.jp/news/2022/07/03/business/tech/kddi-au-system-outage/	nationwide	2022-07-03 10:40:20
海外ニュース	Japan Times latest articles	Japan’s secret to taming the coronavirus: peer pressure	https://www.japantimes.co.jp/news/2022/07/03/national/japan-coronavirus-peer-pressure/	coronavirus	2022-07-03 10:03:08
北海道	北海道新聞	土石流１年、熱海市が追悼式　一斉サイレンで黙とう	https://www.hokkaido-np.co.jp/article/701196/	災害関連死	2022-07-03 10:52:00
北海道	北海道新聞	犠牲最多の熊本で追悼式　２０年の豪雨から２年	https://www.hokkaido-np.co.jp/article/701195/	災害関連死	2022-07-03 10:47:00
北海道	北海道新聞	沖縄で姉妹２人刺される　殺人未遂容疑で知人男逮捕	https://www.hokkaido-np.co.jp/article/701194/	殺人未遂	2022-07-03 10:47:00
北海道	北海道新聞	日本最北スタバ、北見に４日オープン　市内２店目、工業大の向かい	https://www.hokkaido-np.co.jp/article/701087/	東京	2022-07-03 10:28:03
北海道	北海道新聞	＜筋トレで体いきいき＞床からの立ち上がり・座り　マット敷き膝、手首を保護	https://www.hokkaido-np.co.jp/article/701186/	立ち上がり	2022-07-03 10:22:00
ビジネス	東洋経済オンライン	自死した17歳バレー部員､遺族が納得できない訳 暴言指導の顧問に処分は下るも､残った課題 | スポーツ | 東洋経済オンライン	https://toyokeizai.net/articles/-/600826?utm_source=rss&utm_medium=http&utm_campaign=link_back	東洋経済オンライン	2022-07-03 11:00:00
ビジネス	東洋経済オンライン	元女優･君島十和子さんの｢大胆な転身｣のその後 好きだった美容が仕事として花開いた18年間 | 何度でも開花する人 | 東洋経済オンライン	https://toyokeizai.net/articles/-/598193?utm_source=rss&utm_medium=http&utm_campaign=link_back	君島十和子	2022-07-03 10:01:00