How do you use the ? : (conditional) operator in JavaScript?
Jun 7, 2011 · What is the ?: (question mark and colon operator aka. conditional or "ternary") operator and how can I use it?
When should I use ?? (nullish coalescing) vs || (logical OR)?
Related to Is there a "null coalescing" operator in JavaScript? - JavaScript now has a ?? operator which I see in use more frequently. Previously most JavaScript code used ||. let …
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 …
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 …
RegEx for matching "A-Z, a-z, 0-9, _" and "." - Stack Overflow
Nov 12, 2009 · I need a regex which will allow only A-Z, a-z, 0-9, the _ character, and dot (.) in the input. I tried: [A-Za-z0-9_.] But, it did not work. How can I fix it?
Pad a number with leading zeros in JavaScript - Stack Overflow
Apr 9, 2012 · In JavaScript, I need to have padding. For example, if I have the number 9, it will be "0009". If I have several say 10, it will be "0010". Notice how it will …
How do I include a JavaScript file in another JavaScript file?
Jun 4, 2009 · I have loaded div dynamically by clicking menu without page loading by using URL hash. My problem is when i click same page 2/3 times js loading 2/3 times. thats why every …
Clearing all cookies with JavaScript - Stack Overflow
Oct 7, 2008 · How do you delete all the cookies for the current domain using JavaScript?
How do I correctly clone a JavaScript object? - Stack Overflow
Apr 8, 2009 · 2022 update There's a new JS standard called structured cloning. It works in many browsers (see Can I Use). const clone = structuredClone(object); Old answer To do this for …
Get difference between 2 dates in JavaScript? - Stack Overflow
Jul 12, 2010 · How do I get the difference between 2 dates in full days (I don't want any fractions of a day) var date1 = new Date('7/11/2010'); var date2 = new Date('12/12/2010'); var diffDays …