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