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- How do you use the ? : (conditional) operator in JavaScript?
It's a little hard to google when all you have are symbols ;) The terms to use are "JavaScript conditional operator" If you see any more funny symbols in JavaScript, you should try looking up JavaScript's operators first: Mozilla Developer Center's list of operators The one exception you're likely to encounter is the $ symbol To answer your question, conditional operators replace simple if
- When should I use ?? (nullish coalescing) vs || (logical OR)?
Related to Is there a quot;null coalescing quot; operator in JavaScript? - JavaScript now has a ?? operator which I see in use more frequently Previously most JavaScript code used || let userAge =
- Which equals operator (== vs ===) should be used in JavaScript . . .
I'm using JSLint to go through JavaScript, and it's returning many suggestions to replace == (two equals signs) with === (three equals signs) when doing things like comparing idSele_UNVEHtype value
- What does the !! (double exclamation mark) operator do in JavaScript . . .
It converts a nonboolean to an inverted boolean (for instance, !5 would be false, since 5 is a non-false value in JS), then boolean-inverts that so you get the original value as a boolean (so !!5 would be true)
- Usage of the backtick character (`) in JavaScript - Stack Overflow
In JavaScript, a backtick† ( ` ) seems to work the same as a single quote For instance, I can use a backtick to define a string like this: var s = `abc`; Is there a way in which the behavior of the
- Javascript中!! 是什么意思？ - 知乎
我们都知道「!」是「非」的意思，那么「!!」就是「双非」的意思，「双非」是啥，说的就是写代码的人毕业的学校既不是 985 又不是 211，懂了吗。 好机灵抖完了，认真说下为什么会有这种搞法，就算我写了快十年 JavaScript 我还是要说一句，它是一个操蛋的语言，其中一个最为操蛋之处就是「隐式
- Node. js cannot find installed module on Windows
I am learning Node js at the moment on Windows Several modules are installed globally with npm cmd, and Node js failed to find the installed modules Take Jade, for example, npm install jade -g J
- js文件是什么？怎么打开js文件？ - 知乎
js文件可以理解为是JavaScript的源代码文件，是一种用于实现网页交互效果的脚本语言。 要打开js文件，你需要使用一个文本编辑器或者专门的JavaScript编辑器或者记事本也可以： 使用文本编辑器打开：你可以使用Windows系统自带的记事本，或者使用更专业的文本编辑器如Notepad++、Sublime Text、VS Code等
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