投稿時間:2022-10-16 02:14:32 RSSフィード2022-10-16 02:00 分まとめ(14件)

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js	JavaScriptタグが付けられた新着投稿 - Qiita	公式のTwitter SDKを使ってTweetを取得するメモ (Twitter API v2)	https://qiita.com/n0bisuke/items/6ea729450d00b28b8a12	npmit	2022-10-16 01:26:37
Linux	Ubuntuタグが付けられた新着投稿 - Qiita	Ubuntu 22.04 から 22.10 へのアップグレードの仕方	https://qiita.com/Nelson605/items/0f669b93bc76d481bb7b	tupdatesudoaptfullupgrade	2022-10-16 01:13:46
golang	Goタグが付けられた新着投稿 - Qiita	【Go】`fmt.Sprintf`で同じ変数を複数の箇所に埋め込みたい	https://qiita.com/someone7140/items/1d944dccdb440bc1ca7e	fmtsprintf	2022-10-16 01:57:53
海外TECH	DEV Community	How to get the last element of an Array in Javascript	https://dev.to/smpnjn/how-to-get-the-last-element-of-an-array-in-javascript-2hmc	How to get the last element of an Array in JavascriptSo you have a Javascript array and you want to get the last element Take this example for instance let myArray ️ This array has items and as you might know to get any element within it we can use the square bracket notation For example to get the lighting bolt we can use myArray let myArray ️ console log myArray ️Since arrays start at an index of the first element is actually myArray and so on So to get the last element of the array we can use myArray length This gets the length of the array and subtracts to take into consideration that arrays start counting at Therefore to get the last element of an array using the square bracket notation we can do something like this let myArray ️ console log myArray myArray length This is the most common way to get the last element of an array However you can also use the at method to do the same thing let myArray ️ console log myArray at myArray length And even better you can simply write myArray at This greatly simplifies getting the last element of an array to a simple expression let myArray ️ console log myArray at As you might expect at starts counting backwards so at will return the key let myArray ️ console log myArray at	2022-10-15 16:39:11
海外TECH	DEV Community	Updating Object Key Values with Javascript	https://dev.to/smpnjn/updating-object-key-values-with-javascript-1gnm	Updating Object Key Values with JavascriptJavascript objects consist of key value pairs and are one of the most common data structures in Javascript To update all values in an object the easiest way is to Use Object keys to get all keys of the object Apply any logic to decide which values should be updated Update the value of each using a loop like forEach or for For example let myObject name John skillItem skillItem skillItem skillItem Updates any numerical values that are more than or equal to and changes them to Object keys myObject forEach item gt if typeof myObject item number amp amp myObject item gt myObject item console log myObject Returns let myObject name John skillItem skillItem skillItem skillItem You don t have to apply logic but it s usually useful You can also achieve this with a for loop which is slightly faster than using forEach let myObject name John skillItem skillItem skillItem skillItem Updates any numerical values that are more than or equal to and changes them to for let item of Object keys myObject if typeof myObject item number amp amp myObject item gt myObject item console log myObject Returns let myObject name John skillItem skillItem skillItem skillItem To update only one value in an object use the square bracket notation to select which key you want to update For example let myObject name John skillItem skillItem skillItem skillItem Updates skillItem to myObject skillItem Javascript objects are created by reference which is a fancy way of saying that when we make the changes above we are mutating the original object That also means that Object values does not allow us to update the values of the object which is why we have to use Object keys	2022-10-15 16:34:50
海外TECH	DEV Community	Waiting for the DOM to be ready in Javascript	https://dev.to/smpnjn/waiting-for-the-dom-to-be-ready-in-javascript-42l7	Waiting for the DOM to be ready in JavascriptWhen you re working with Javascript you re likely to have run into a pretty common problem if your Javascript appears before your HTML then trying to do things like attach events to your HTML is not possible For example consider this code lt DOCTYPE HTML gt lt html gt lt head gt lt script type text javascript gt document querySelector button addEventListener click gt console log You clicked me lt script gt lt head gt lt body gt lt button id button gt Click Me lt button gt lt body gt lt html gt Even though there is a button with the ID button this code actually throws an error The reason why is because the Javascript is loading before the DOM Therefore trying to query select for button returns null Uncaught TypeError Cannot read properties of null reading addEventListener at file html This is a pretty common problem related to DOM readiness your HTML DOM has not loaded so it is not ready to have Javascript applied to it Waiting for the DOM to be ready in JavascriptIf you want to wait for the HTML to load before your Javascript runs then try using DOMContentLoaded We can wrap our entire Javascript in this event listener like so window addEventListener DOMContentLoaded gt document querySelector button addEventListener click gt console log You clicked me Now no error will be produced in your code since the code within the DOMContentLoaded event listener will only fire once the HTML is fired That means you can continue to have your Javascript before your HTML and encounter no issues Of course you can also solve this problem by putting your Javascript after your HTML but this is not always possible I hope you ve enjoyed this quick guide to DOM Readiness and DOMContentLoaded in Javascript	2022-10-15 16:29:27
ニュース	BBC News - Home	Chancellor warns of tax rises and squeeze on spending	https://www.bbc.co.uk/news/uk-63268238?at_medium=RSS&at_campaign=KARANGA	economic	2022-10-15 16:46:28
ニュース	BBC News - Home	Mason Greenwood charged with attempted rape and assault	https://www.bbc.co.uk/news/uk-england-63272019?at_medium=RSS&at_campaign=KARANGA	greenwood	2022-10-15 16:36:38
ニュース	BBC News - Home	Andrew Bailey: Bank of England 'will not hesitate to raise rates' to meet inflation target	https://www.bbc.co.uk/news/uk-63272386?at_medium=RSS&at_campaign=KARANGA	Andrew Bailey Bank of England x will not hesitate to raise rates x to meet inflation targetThe Bank s governor says inflationary pressures may require a stronger response than originally forecast a couple of months ago	2022-10-15 16:18:55
ニュース	BBC News - Home	Rugby League World Cup: England 60-6 Samoa - Welsby, Young, Watkins, Farnworth score	https://www.bbc.co.uk/sport/rugby-league/63271368?at_medium=RSS&at_campaign=KARANGA	Rugby League World Cup England Samoa Welsby Young Watkins Farnworth scoreHosts England open the delayed Rugby League World Cup by ruthlessly taking apart a desperately poor Samoa at St James Park	2022-10-15 16:18:47
ニュース	BBC News - Home	Fulham 2-2 Bournemouth: Cherries stay unbeaten under Gary O'Neil	https://www.bbc.co.uk/sport/football/63182449?at_medium=RSS&at_campaign=KARANGA	cottage	2022-10-15 16:54:11
ニュース	BBC News - Home	Rugby League World Cup: England cruise to victory over Samoa	https://www.bbc.co.uk/sport/av/rugby-league/63271635?at_medium=RSS&at_campaign=KARANGA	england	2022-10-15 16:58:19
ニュース	BBC News - Home	Wolves 1-0 Nottingham Forest: Ruben Neves scores penalty and Brennan Johnson misses penalty	https://www.bbc.co.uk/sport/football/63182451?at_medium=RSS&at_campaign=KARANGA	Wolves Nottingham Forest Ruben Neves scores penalty and Brennan Johnson misses penaltyWolves goalkeeper Jose Sa saves a Brennan Johnson penalty after Ruben Neves converts from the spot against Nottingham Forest	2022-10-15 16:23:03
北海道	北海道新聞	鎌田大地、ＰＫ２本で２ゴール　ドイツ１部、遠藤航も得点	https://www.hokkaido-np.co.jp/article/745989/	鎌田大地	2022-10-16 01:08:08