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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
  • 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
  • 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 =
  • What does the !! (double exclamation mark) operator do in JavaScript . . .
    I saw this code: this vertical = vertical !== undefined ? !!vertical : this vertical; It seems to be using !! as an operator, which I don't recognize What does it do?
  • 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
  • How can I update Node. js and npm to their latest versions?
    How to update Node js To update Node js itself, I recommend you use nvm (Node Version Manager) Here is the quote from the official npm documentation: We strongly recommend using a Node version manager like nvm to install Node js and npm




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