For a complete reference, go to our Complete JavaScript Boolean Reference. The reference contains descriptions and examples of all Boolean properties and methods.

Mar 6, 2025 · Boolean values can be one of two values: true or false, representing the truth value of a logical proposition. Boolean values are typically produced by relational operators, equality operators, and logical NOT (!). They can also be produced by functions that represent conditions, such as Array.isArray().

Feb 1, 2020 · Booleans are a primitive datatype commonly used in computer programming languages. By definition, a boolean has two possible values: true or false. In JavaScript, there is often implicit type coercion to boolean. If for example you have an if statement which checks a certain expression, that expression will be coerced to a boolean:

Dec 11, 2024 · To represent logical values, JavaScript uses the Boolean data type, which has two possible values: true or false. These values often result from comparisons or logical operations. Additionally, the Boolean () function can convert other types of values into Boolean, determining their truthy or falsy nature.

In addition to the boolean primitive type, JavaScript also provides you with the global Boolean() function, with the letter B in uppercase, to cast a value of another type to boolean. The following example shows how to use the Boolean() function to convert a string into a boolean value.

In JavaScript, booleans are the primitive data types that can either be true or false. For example, const b = false; Note: If you wrap true or false in a quote, then they are considered as a string. For example, console.log(typeof a); // string. The boolean values are mostly used for Comparison and Logical Operators. For example,

JavaScript booleans can have one of two values: true or false. You can use the Boolean() function to find out if an expression is true: Or even easier: The JavaScript Boolean Tutorial. Track your progress - it's free!

Introduction to the JavaScript boolean type. The JavaScript boolean primitive type has two literal values: true and false. The following example declares two variables and initializes their values to true and false: let completed = true; let running = false; Code language: JavaScript (javascript) The boolean’s literal values are case-sensitive.

A JavaScript boolean let’s you know whether something is TRUE or FALSE, on or off, yes or no, etc. Learn how to use boolean values in your JavaScript coding today!

JavaScript Booleans are a fundamental data type that allows developers to represent truthy and falsy values. Booleans are critical for decision-making in programming, as they help control which part of the code executes.