isBoolean()

isBoolean(value): value is boolean

Checks if a value is a boolean.

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Parameters

value: unknown

The value to check.

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Returns: value is boolean

true if the value is a boolean, false otherwise.

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Since

1.0.0

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Example

isBoolean(true);  // => true
isBoolean(false); // => true
isBoolean(1);     // => false
isBoolean('true'); // => false

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How it works?

Type guard that checks if a value is a boolean.

Type Narrowing

Common Checks

Value	Result
true	true
false	true
Boolean(1)	true
new Boolean(true)	false (boxed)
1	false
'true'	false

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Use Cases

Check binary flags 📌

Verify if a value is strictly true or false. Perfect for validating configuration flags or toggle states.

#check#boolean#flags#binary#toggle#configuration

if (isBoolean(config.isEnabled)) {
  toggleFeature(config.isEnabled);
}