JavaScript Boolean Reference


JavaScript Booleans

JavaScript booleans can have one of two values: true or false.


The Boolean() Function

You can use the Boolean() function to find out if an expression is true:

Example

Boolean(10 > 9)
Try it Yourself »

Or even easier:


JavaScript Boolean Methods and Properties

Name Description
constructor Returns the function that created JavaScript's Boolean prototype
prototype Allows you to add properties and methods to the Boolean prototype
toString() Converts a boolean value to a string, and returns the result
valueOf() Returns the primitive value of a boolean

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