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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
- 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
- 如何循序渐进、有效地学习JavaScript？ - 知乎
这个深有体会，分享一篇文章《如何学习javascript》 (内容在下面) 首先要说明的是，咱现在不是高手，最多还是一个半桶水，算是入了JS的门。 谈不上经验，都是一些教训。 这个时候有人要说，“靠，你丫半桶水，凭啥教我们”。您先别急着骂，先听我说。 你叫一个大学生去教小学数学，不见得比
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