You can use the Boolean() function to find out if an expression (or a variable) is true: Or even easier: The chapter JS Comparisons gives a full overview of comparison operators. The chapter JS If Else gives a full overview of conditional statements. Here are some examples:

Mar 26, 2013 · It is possible to do. You can also pass the non boolean variable into the new Boolean() and it will make IsLoggedIn boolean. Don't use new Boolean (); IsLoggedIn will evaluate to true in all of those situations (yes, new Boolean …

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().

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.

Feb 2, 2024 · This tutorial article explains how you can declare a Boolean variable in JavaScript.

Learn how to declare a boolean in JavaScript with this comprehensive guide. Understand the syntax and usage of boolean values.

May 26, 2021 · Javascript booleans may be true, false, or (in certain contexts) a value that evaluates to either true or false. It is important to manage boolean contexts properly because many Javascript constructs rely on them. This article describes what Javascript booleans are and how to use them appropriately in different programming contexts.

Feb 1, 2020 · 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: const a = 'a string' ; if (a) { console .log(a); // logs 'a string' }

The boolean (not Boolean) is a primitive data type in JavaScript. It can have only two values: true or false. It is useful in controlling program flow using conditional statements like if else , switch , while loop , etc.

Learn how to declare boolean variables in JavaScript with clear examples and explanations.