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  1. javascript - When should I use ?? (nullish coalescing) vs || (logical ...

    ) 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:

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

    Dec 11, 2008 · JavaScript has two sets of equality operators: === and !==, and their evil twins == and !=. The good ones work the way you would expect. The good ones work the way you …

  3. How to use OR condition in a JavaScript IF statement?

    Mar 2, 2010 · In JavaScript, if you're looking for A or B, but not both, you'll need to do something similar to:

  4. What does the !! (double exclamation mark) operator do in …

    A third use is to produce logical XOR and logical XNOR. In both C and JavaScript, a && b performs a logical AND (true if both sides are true), and a & b performs a bitwise AND. a || b …

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

    Mar 29, 2022 · Unlike many similar languages, identifiers (such as functional and variable names) in Javascript can contain not only letters, numbers and underscores, but can also contain …

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

    Jun 7, 2011 · 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 …

  7. What does "javascript:void (0)" mean? - Stack Overflow

    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 …

  8. What's the difference between & and && in JavaScript?

    This operator is almost never used in JavaScript. Other programming languages (like C and Java) use it for performance reasons or to work with binary data. In JavaScript, it has questionable …

  9. What does ${} (dollar sign and curly braces) mean in a string in ...

    Mar 7, 2016 · I haven't seen anything here or on MDN. I'm sure I'm just missing something. There's got to be some documentation on this somewhere.

  10. How can I use modulo operator (%) in JavaScript? [duplicate]

    having trouble to understand JavaScript 100%3 and answer comes out 1 in console. 0. loop popup confusion.