JavaScript's double not operatoris basically double use of (!) operator. This is alogical not operator. (!!) operator converts non-Boolean to Boolean. As you know,!operator reverses the logic, i.e., it returnfalsefor!truevalue andtruefor!false. Examples of (!) Operator !false Output: ...
is not an operator, it's just the!operator twice. Real World Example "Test IE version": let isIE8 = false; isIE8 = !! navigator.userAgent.match(/MSIE 8.0/); console.log(isIE8); // returns true or false 1. 2. 3. If you ⇒ console.log(navigator.userAgent.match(/MSIE 8.0/)...
I've seen some people usingvoidoperator in their code. I have also seen this inhrefattributes:javascript:void(0)which doesn't seem any better thanjavascript:; So, what is the justification of using thevoidoperator? 回答 The JavaScript, thevoidoperator is used to explicitly return undefined. I...
(not not) operator inJavaScript.This double negation forces a value to be evaluated as either true or false. What is the !! Operator? The double negation(!! )operatoris the! Operator twice and calculates the truth value of a value. It returns aBoolean value, which depends on the truthine...
The decrement operator in Javascript decreases an integer value by one. This operator is often utilized in loops, counters, and mathematical computations where a value has to be decreased sequentially. Types of Decrement Operators The decrement operator (--) can be used in two ways ? Post-...
While many people are familiar with Java from interactive website features, users may be less familiar with JavaScript — or, indeed, they may wrongly consider the two to be the same.In this article, we discuss what JavaScript is and the differences between Java and JavaScript. Then we’ll ...
5 === "5" // false JavaScript Copy In this case, the comparison returns false because the type of the two values is different. Here's an example of using the "===" operator in JavaScript: let num = 5; let str = "5"; if(num === str){ console.log("num and str are equal"...
The ObjectMaker function was executed, with // obj1 in place of this... so obj.a was set to 'first'. obj.a; // returns 'first' obj.b; // obj doesn't have a property called 'b', so JavaScript checks // its [[prototype]]. Its [[prototype]] is the same as ObjectMaker....
A brief explanation to what hoisting means in the JavaScript programming languageJavaScript before executing your code parses it, and adds to its own memory every function and variable declarations it finds, and holds them in memory. This is called hoisting....
So, what is the difference between a normal function and an arrow function? 🤔️ 1. this points to In JavaScript, thethisis a basic and important knowledge point. 1.1 Ordinary functions In ordinary functions,thisis dynamic, and its value depends on how the function is called. There are...