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What does the !! (double exclamation mark) operator do in JavaScript . . . 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
What is the purpose of the dollar sign in JavaScript? 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
How do you use the ? : (conditional) operator in JavaScript? 27 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 try looking up JavaScript's operators first: Mozilla Developer Center's list of operators The one exception you're likely to encounter is the $ symbol
Whats 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 performance, and we rarely work with binary data This operator expects two numbers and returns a number In case they are not numbers, they are cast to
JavaScript OR (||) variable assignment explanation - Stack Overflow That is, JavaScript "short-circuits" the evaluation of Boolean operators and will return the value associated with either the first non-false variable value or whatever the last variable contains See Anurag's explanation of those values that will evaluate to false Using this technique is not good practice for several reasons; however
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 The primitive types boolean, string and number can be wrapped by their object counterparts These objects are instances of the Boolean, String and Number constructors respectively