About 21,000,000 results
Open links in new tab
  1. 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

  2. How do you use the ? : (conditional) operator in JavaScript?

    Jun 7, 2011 · JS is code that gets sent to the browser, so code length matters – TheRealMrCrowley. Commented May 11 ...

  3. Which equals operator (== vs ===) should be used in JavaScript ...

    Dec 11, 2008 · 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 …

  4. What is the purpose of the dollar sign in JavaScript?

    Mar 29, 2022 · 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 …

  5. Usage of the backtick character (`) in JavaScript - Stack Overflow

    Dec 28, 2014 · It's a pretty useful functionality, for example here is a Node.js code snippet to test the set up of a 3 second timing function. const waitTime = 3000; console.log(`setting a …

  6. 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 …

  7. What is the difference between .js and .mjs files?

    Aug 14, 2019 · 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 …

  8. Check/Uncheck checkbox with JavaScript - Stack Overflow

    Nov 21, 2011 · fyi: just tested this onclick="document.getElementById('dmsmh_chk').checked = !document.getElementById('dmsmh_chk').checked;" this behaves like a jQuery toggle in plain …

  9. How do I check for null values in JavaScript? - Stack Overflow

    Jan 4, 2024 · There's also the Underscore.js method, which seems even more confusing/blackbox, but worth noting anyway because it takes advantage of NaN !== NaN. …

  10. RegEx for matching "A-Z, a-z, 0-9, _" and "." - Stack Overflow

    May 14, 2019 · ^[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.