JavaScript: Check whether the given argument is a native boolean element

JavaScript fundamental (ES6 Syntax): Exercise-204 with Solution

Check Native Boolean

Write a JavaScript program that checks if the given argument is a native Boolean element.

• Use typeof to check if a value is classified as a boolean primitive.

Sample Solution:

JavaScript Code:

// Define a function 'isBoolean' that checks if the type of the input value is boolean
const isBoolean = val => typeof val === 'boolean';

// Test cases to check if the input value is a boolean
console.log(isBoolean(null)); // false (null is not a boolean)
console.log(isBoolean(false)); // true (false is a boolean)

Output:

false
true

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-204-1 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that returns true if a given value is exactly a native Boolean (true or false).
• Write a JavaScript function that checks if an input’s constructor is Boolean and returns a boolean result.
• Write a JavaScript program that distinguishes Boolean primitives from Boolean objects.
• Write a JavaScript function that uses typeof and instanceof to validate a native Boolean value.

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