Programming Tutorials

Boolean() function in JavaScript

By: Stella in Javascript Tutorials on 2023-04-25  

The Boolean() function in JavaScript is used to convert a value into a boolean data type. The function takes a single parameter and returns true or false.

The function can be called in two ways: with the new operator or without it. If called with the new operator, it creates a new Boolean object. If called without the new operator, it returns a boolean primitive.

When the parameter is a primitive value, the function returns true for truthy values and false for falsy values. The following values are considered falsy in JavaScript:

  • false
  • 0 (zero)
  • "" (empty string)
  • null
  • undefined
  • NaN (Not-a-Number)

All other values are considered truthy.

Here are some examples:

Boolean(true);     // true
Boolean(false);    // false
Boolean(0);        // false
Boolean(1);        // true
Boolean("");       // false
Boolean("hello");  // true
Boolean(null);     // false
Boolean(undefined);// false
Boolean(NaN);      // false

It's important to note that the Boolean() function is not the same as the boolean keyword in JavaScript. The boolean keyword is used to declare a variable as a boolean data type, while the Boolean() function is used to convert a value into a boolean data type.

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