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
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
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
Why would a JavaScript variable start with a dollar sign? A valid JavaScript identifier shuold must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9) Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase)
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
Usage of the backtick character (`) in JavaScript The backtick character (`) in JavaScript is used to define template literals A template literal is a special type of string that allows you to embed expressions, which are evaluated and included in the final string