The nullish coalescing operator (??) in JavaScript only considers null or undefined as "nullish" values. If the left-hand side is any other value, even falsy values like "" (empty string), 0, or false, it will not use the right-hand side:

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 idSele_UNVEHtype.value.

Novice JavaScript developers need to know that the "not not" operator is using implicitly the original loose comparison method instead of the exact === or !== operators and also the hidden cast operation that is happening behind the scenes and I show it in the example I provide.

Jun 7, 2011 · The conditional (ternary) operator is the only JavaScript operator that takes three operands. This operator is frequently used as a shortcut for the if statement.

Mar 29, 2022 · Javascript does have types; and in any case, how is the dollar sign even related to that? It's just a character that happens to be a legal identifier in Javascript.

Mar 2, 2010 · How to use OR condition in a JavaScript IF statement? Asked 15 years, 4 months ago Modified 2 years, 6 months ago Viewed 874k times

Mar 7, 2016 · What does $ {} (dollar sign and curly braces) mean in a string in JavaScript? Asked 9 years, 4 months ago Modified 1 year, 7 months ago Viewed 418k times

Another thing to bear in mind is that Javascript will cast any oversized values to within range if bitwise-anded with itself. Eg, const b = 99999999999999999; console.log(b & b); // 1569325056 - this can be useful when working with things like hashing functions which often deal with huge esoteric numbers

Aug 27, 2010 · In all other cases, you're safe to use ==. Not only is it safe, but in many cases it simplifies your code in a way that improves readability. I still recommend Crockford's talk for developers who don't want to invest the time to really understand Javascript—it's good advice for a developer who only occasionally works in Javascript.

Aug 18, 2009 · In addition to the technical answer, javascript:void means the author is Doing It Wrong. There is no good reason to use a javascript: pseudo-URL (*). In practice it will cause confusion or errors should anyone try things like ‘bookmark link’, ‘open link in a new tab’, and so on. This happens quite a lot now people have got used to middle-click-for-new-tab: it looks like …