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.

Dec 31, 2014 · The short answer: using the new Boolean () constructor creates a wrapper around your value so that calling the variable always returns true. If all you want to do is store true/false, without any extra functions or logic on the variable holding the value, then you should probably just assign it directly. ie, var deletemode = false.

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

In this lesson, you learned how to write boolean values in JavaScript. Here is a summary of the topics we covered: The two values that can be assigned to a boolean variable; Comparison operators in JavaScript; The two JavaScript operators available for testing equality

Aug 21, 2024 · Boolean literals are the simplest form of booleans. You create them by directly assigning true or false to a variable: let isLoggedIn = false; These are primitive values, and they're the most common and efficient way to use booleans in your code. You can also create boolean objects using the Boolean() constructor function:

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

Mar 17, 2025 · In JavaScript, you can declare a boolean variable using the var, let, or const keywords followed by the variable name and either true or false as the initial value. Here's an example: javascript var isRaining = true; let hasLoggedIn = false; const isDarkMode = true;