JavaScript Boolean Reference

Last Updated : 23 May, 2023

JavaScript Boolean is a datatype that returns either true or false In JavaScript, a boolean is used as a function to get the value of a variable, object, conditions, expressions, etc in terms of true or false

Syntax:

Boolean(variable/expression)

Example: If the operands are equal, the equal to operator == returns true

Javascript

<script> 
    console.log(15 == 15) 
    console.log(15 == 11) 
</script>

Output:

true
false

The complete list of JavaScript Boolean has listed below:

JavaScript Boolean Constructor: A constructor gets called when an object is created using the new keyword.

Constructor	Descriptions	Examples
Boolean()	Create Boolean objects or return primitive values of type boolean.	Try

JavaScript Boolean Properties: A JavaScript property is a member of an object that associates a key with a value.

Instance Property: An instance property is a property that has a new copy for every new instance of the class.

Instance Properties	Descriptions	Examples
constructor	Add a new property and methods to all Boolean instances.	Try

JavaScript Boolean Methods: Methods are actions that can be performed on objects.

Instance Method: If the method is called on an instance of a boolean then it is called an instance method.

Instance Methods	Descriptions	Examples
valueOf()	Returns the value of boolean object.	Try
toString()	Returns a string according to the Boolean value.	Try

GeeksforGeeks

News

Improve

JavaScript Boolean

Similar Reads

Explain non-boolean value coercion to a boolean one in JavaScript

As we all know javascript is a forgiving language. It does not mind silly mistakes which programmers do. So, sometimes it gives unexpected results. So it senses Javascript says "I can do every possibility". Coercion is one of those in which javascript gives weird results because javascript automatically performs type conversion in which first value

JavaScript Boolean valueOf() Method

The boolean.valueOf() method is used to return a boolean value either "true" or "false" depending upon the value of the specified boolean object. Syntax: boolean.valueOf() Parameter: This method does not accept any parameter. Return value: It returns a boolean value either "true" or "false" depending upon the value of the specified boolean object.

JavaScript Boolean toString() Method

The boolean.toString() method is used to return a string either "true" or "false" depending upon the value of the specified boolean object. Syntax: boolean.toString() Parameter: This method does not accept any parameter. Return Values: It returns a string either "true" or "false" depending upon the value of the specified boolean object. Below are e

JavaScript Boolean() Constructor

The Boolean() constructor in JavaScript is a built-in function that can be used to create a new Boolean object. The Boolean() constructor takes a single argument and returns a Boolean object with a value of true or false depending on the type and value of the argument passed in. Syntax: Boolean(value) Parameter: This constructor accepts a single ar

JavaScript Boolean Constructor Property

JavaScript boolean constructor property returns the constructor function for an object. The function which is returned by this property is just the reference to this function, not a Boolean containing the function’s name The JavaScript number constructor, string constructor, and boolean constructor return function Boolean() { [native code] }, funct

Implement a Function that Accept Array and Condition and Returns Boolean Values in JavaScript

In JavaScript language every function is a special function that checks the element of the array with the condition given in the input, Each element is checked against the condition, and if the condition is satisfied then every function returns the true result else if any of the element of the array fails against the condition then the false result

How to convert Number to Boolean in JavaScript ?

We convert a Number to Boolean by using the JavaScript Boolean() method and double NOT operator(!!). A JavaScript boolean results in one of two values i.e. true or false. However, if one wants to convert a variable that stores integer “0” or “1” into Boolean Value i.e. "false" or "true". Below are the approaches: Table of Content Boolean() methodU

How to toggle a boolean using JavaScript ?

A boolean value can be toggled in JavaScript by using two approaches which are discussed below: Table of Content Using the logical NOT operatorUsing the ternary operatorUsing the XOR (^) operatorMethod 1: Using the logical NOT operator The logical NOT operator in Boolean algebra is used to negate an expression or value. Using this operator on a tru

How to use the ! Operator to negate a Boolean Value in JavaScript ?

In JavaScript, you can use the ! (logical NOT) operator to negate a boolean value. The ! operator flips the truthiness of a value. If the operand is true, it becomes false, and if the operand is false, it becomes true. Example: Here, !isTrue evaluates to false, and !isFalse evaluates to true. C/C++ Code let isTrue = true; let isFalse = false; let n

JavaScript Program for Boolean to String Conversion

This JavaScript program is designed to convert a boolean value to its corresponding string representation. In JavaScript, boolean values can either be true or false. The goal is to create a function that takes a boolean input and returns a string representation of that boolean value ("true" for true, and "false" for false). Below are the methods to

JavaScript Convert a string to boolean

To Convert a string to Boolean, we have multiple approaches. We are going to learn how to Convert a string to Boolean. Below are the approaches used to Convert a string to Boolean: Table of Content Approach 1: Using JavaScript == OperatorApproach 2: Using JavaScript === OperatorApproach 3: Using the Boolean() functionApproach 4: Using a regular exp

Sort an array of objects using Boolean property in JavaScript

Given the JavaScript array containing Boolean values. The task is to sort the array on the basis of Boolean value with the help of JavaScript. There are two approaches that are discussed below: Table of Content Using Array.sort() Method and === OperatorUsing Array.sort() and reverse() MethodsUsing a Custom Comparator Function for ObjectsUsing Array

JavaScript Boolean

JavaScript Boolean represents true or false values. It's used for logical operations, condition testing, and variable assignments based on conditions. Values like 0, NaN, empty strings, undefined, and null are false; non-empty strings, numbers other than 0, objects, and arrays are true. Note: A variable or object which has a value is treated as a t

How to initialize a boolean array in JavaScript ?

A Boolean array is a collection of variables that can hold only two values: true or false. In JavaScript, Boolean values represent the simplest forms of truthiness and are essential for controlling flow in your programs, such as in conditional statements and loops. Why Use Boolean Arrays?Boolean arrays are useful when you need to track binary state

Convert Boolean Result into Number/Integer in JavaScript

A JavaScript boolean represents one of two values: true or false. However, if one wants to convert a variable that stores a boolean value, into an integer "0" or "1", they can do so using multiple approaches. Below are the approaches to convert a boolean to a number/integer in JavaScript: Table of Content Using ternary or conditional operatorUsing

How to Generate a Random Boolean using JavaScript?

To generate a random boolean in JavaScript, use Math.random(), which returns a random number between 0 and 1. Approach: Using Math.random() functionCalculate Math.random() function.If it is less than 0.5, then true otherwise false.Example 1: This example implements the above approach. [GFGTABS] JavaScript // Function to generate and log a random bo

How to convert string to boolean in PHP?

Given a string and the task is to convert given string to its boolean. Use filter_var() function to convert string to boolean value. Examples: Input : $boolStrVar1 = filter_var('true', FILTER_VALIDATE_BOOLEAN); Output : true Input : $boolStrVar5 = filter_var('false', FILTER_VALIDATE_BOOLEAN); Output : false Approach using PHP filter_var() Function:

p5.js boolean() function

The boolean() function in p5.js is used to convert the given string and number value into its boolean representation. Syntax: boolean(Value) Parameters: This function accepts single parameter Value which are to be converted into its boolean representation. This value might be integer, float, string, boolean, negative or positive value and array of

The Boolean of ES6 is nothing different than the other Boolean objects. It also represents two values True or False. There are two properties and three methods that build this object in ES6 JavaScript. Properties of Boolean Object: JavaScript constructor: In ES6 JavaScript, the constructor property returns the constructor function for an object. Fo

Primer CSS Boolean Attributes

Primer CSS is a free open-source CSS framework that is built upon systems that create the foundation of the basic style elements such as spacing, typography, and color. This systematic method makes sure our patterns are steady and interoperable with every other. Its approach to CSS is influenced by object-oriented CSS principles, functional CSS, an

Angular PrimeNG Form Checkbox Boolean Value Component

Angular PrimeNG is a UI component library for Angular Applications. It offers many pre-built themes and UI components for a variety of tasks like inputs, menus, charts, Buttons, etc. In this article, we will be seeing the Form Checkbox Boolean Value Component in Angular PrimeNG. The Checkbox component provided by PrimeNG is an extension of the HTML

Less.js Logical boolean() Function

Less.js is a simple CSS pre-processor that facilitates the creation of manageable, customizable, and reusable style sheets for websites. It is a dynamic style sheet language that improves CSS's functionality. Cross-browser interoperability is supported by LESS. A scripting language known as CSS pre-processor is used to enhance CSS and compile it in

TypeScript Primitives: String, Number, and Boolean Type

In this article, we are going to learn about TypeScript primitives: string, number, and boolean Type in Typescript. These are the most used and basic data types. Below we will learn about string, number, and boolean in detail. TypeScript Primitive DataTypesSimilar to JavaScript's mostly used data types TypeScript has mainly 3 primitives String: Typ

How to Convert String to Boolean in TypeScript ?

In Typescript, sometimes you receive the data as strings but need to work with boolean values or identify the boolean equivalent of it. There are several approaches to convert string to boolean in TypeScript which are as follows: Table of Content Using Conditional StatementUsing JSON.parse() MethodUsing Type AssertionUsing Regular ExpressionsUsing

Boolean Data Type

In programming languages, we have various data types to store different types of data. Some of the most used data types are integer, string, float, and boolean. The boolean data type is a type of data that stores only two types of values i.e. True or False. These values are not case-sensitive depending upon programming languages. The name Boolean c

SASS Booleans and Boolean Operators

SASS supports boolean values (true and false) and provides tools for conditional compilation based on these boolean values. This allows you to control which styles are compiled based on certain conditions, making your CSS more dynamic and adaptable. Additionally, SASS includes boolean operators (and, or, and not) for logical expressions. Assigning

How to validate if input in input field has boolean value using express-validator ?

In HTML forms, we often required validation of different types. Validate existing email, validate password length, validate confirm password, validate to allow only integer inputs, these are some examples of validation. In a certain input field, only boolean value i.e. true or false are allowed. We can also validate these input fields to accept onl

JavaScript is showing reference error "Prompt is not defined"

In this article, we cover the reference error that is "Prompt is not defined". It's important to understand the tools you are using. I know, this can be very overwhelming in the beginning. but here, we will solve this reference error with not only one solution but also make more ways to done properly. window.prompt() instructs the browser to displa

JavaScript Math Reference

JavaScript Math object is used to perform mathematical operations on numbers. Math is an inbuilt object that works with numbers types but it does not work with BigInt. Example: Below example will give you a brief idea of JavaScript math objects. C/C++ Code // Return PI value(3.141592653589793) console.log(Math.PI); Output: This will print the value

JavaScript BigInt Reference

JavaScript BigInt is an inbuilt object in JavaScript that provides a way to represent whole numbers larger than 253-1 which is the largest number that can represent with the Number primitive. It is represented by the MAX_SAFE_INTEGER constant. Example: This example creates a BigInt by appending n at the end of the number. C/C++ Code // Decimal form

Article Tags :