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 …

May 5, 2021 · Understanding the logical not operator in JavaScript Asked 4 years, 9 months ago Modified 4 years, 9 months ago Viewed 1k times

Mar 13, 2021 · I am slightly confused on the logical NOT operator in Javascript (!). From my understanding, this is mainly used to "inverse" a boolean value. For example, if an …

Sep 22, 2015 · 7 Why am I unable to use the ! operator while invoking a function (e.g., _.filter([1,2,3], !isEven))? Note that you are actually not invoking isEven, you are merely referencing it. As you said, …

Agreed, this is my favorite answer as it specifically addresses JavaScript variable assignment concerns. Additionally, if you choose to use a ternary as one of the subsequent variables to test for assignment …

Jun 3, 2012 · This is the strict not equal operator and only returns a value of true if both the operands are not equal and/or not of the same type. The following examples return a Boolean true:

In fact, the only time that I could think of that it would be legitimate to use the double not operator is if you wanted to do a strict comparison to another boolean value (so maybe in return value that …

Mar 23, 2011 · Possible Duplicate: What is the !! operator in JavaScript? What is a not not in javascript I have seen this a few times :) function foo(){ return !!(window.history); }

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 …

With optimisation of the JavaScript engine in browsers, the performance for operators and functions change. With current browsers, using ~~ instead of Math.floor is somewhat faster in some browsers, …