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- How do you use the ? : (conditional) operator in JavaScript?
JS is code that gets sent to the browser, so code length matters – TheRealMrCrowley Commented May 11
- When should I use ?? (nullish coalescing) vs || (logical OR)?
I did see that description in that questions answer, but it's seemed like a repeat of well known JS boolean logic rather than a specific example – mikemaccana Commented Apr 28, 2020 at 13:18
- What is the purpose of the dollar sign in JavaScript?
A '$' in a variable means nothing special to the interpreter, much like an underscore From what I've seen, many people using jQuery (which is what your example code looks like to me) tend to prefix variables that contain a jQuery object with a $ so that they are easily identified and not mixed up with, say, integers
- 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 is the difference between . js and . mjs files?
Node js's original module system is CommonJs (which uses require and module exports) Since Node js was created, the ECMAScript module system (which uses import and export) has become standard and Node js has added support for it Node js will treat cjs files as CommonJS modules and mjs files as ECMAScript modules
- How to iterate (keys, values) in JavaScript? - Stack Overflow
A basic doubt here I landed here looking for how to do this in node js, which is javascript on server side How do I know which ES version applies in my case Also, in case of regular javascript users, what is the proper way to support as I understand that ES version depends on the client's browser? –
- 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) –
- RegEx for matching A-Z, a-z, 0-9, _ and . - Stack Overflow
^[A-Za-z0-9_ ]+$ From beginning until the end of the string, match one or more of these characters Edit: Note that ^ and $ match the beginning and the end of a line
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