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  1. 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 …

  2. 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:

  3. 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 …

  4. 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 …

  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. 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 …

  7. What is the difference between != and !== operators in JavaScript?

    Jan 5, 2021 · Also at In JavaScript, is '!=' the same as '!=='?. More answers, but this is the duplicate target. More answers, but this is the duplicate target. – Peter Mortensen

  8. 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:

  9. Is there a "null coalescing" operator in JavaScript?

    Jan 25, 2009 · After reading your clarification, @Ates Goral's answer provides how to perform the same operation you're doing in C# in JavaScript. @Gumbo's answer provides the best way to …

  10. javascript - What does [object Object] mean? - Stack Overflow

    In JavaScript there are 7 primitive types: undefined, null, boolean, string, number, bigint and symbol. Everything else is an object. Everything else is an object. The primitive types boolean …