In this article, we will learn about the !! (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 retur...
But NaN is not equal to itself. It means that for NaN equality is anti-reflexive, while inequality is reflexive. Hence the name. Copy >NaN==NaNfalse>NaN!=NaNtrue Second, how to get NaN in JavaScript? If we try to make a number from a non-numeric string, JavaScript will not throw a...
It decides what thethiskeyword will point at based on what object is used to invoke thesayHellofunction. Looking at both call sites in the example above, we can tell that thethiskeyword will be equal to the object in front of the function call. Sogreet2.sayHello()says invoke the function...
No matter where it is executed or where it is executed, the value of this inside the arrow function is always equal to the value of the outer function, that is, the arrow function does not change the direction of this. const obj = { fnc(arr) { console.log(this); // obj const cb...
The following syntax will show you how you can assign a variable with a value equal to NaN and the syntax of using the isNaN() method in JavaScript ? Number.isNaN OR isNaN(Number); In the above syntax, we have assigned the variable with the NaN value and then check if it is NaN...
log("num and str are not equal"); } JavaScript Copy In this example, we declare two variables: "num" and "str". Although "num" is a number and "str" is a string, we use the "==" operator to compare them. Because of type coercion, JavaScript will convert the string "5" to a...
visible functionality is not working on server in asp.net tag inside table cell creates a line break in IE 7 tag wrapping 0x800a1391 - JavaScript runtime error: 'Page_ClientValidate' is undefined 1 month calendar on an asp.net page 1.1 How do I make a textbox case sensitive?
The problem is that the value this inside of the arrow function equals this of the outer scope. Always. But what you want is this to equal world object.That's why this inside of the arrow function equals the global object: window in a browser. 'Hello, ${this.who}!' evaluates as ...
.pdb files in production environment? 'An operation was attempted on a nonexistent network connection' error 'bootstrap' is not a valid script name. The name must end in '.js'. 'Cannot implicitly convert 'System.TimeSpan' to 'System.DateTime' 'DayOfWeek' is not supported in LINQ to E...
What does "object destructuring" mean and what is the result of a destructuring operation?Say you have an object with some properties:const person = { firstName: 'Tom', lastName: 'Cruise', actor: true, age: 57 }You can extract just some of the object properties and put them into ...