isBoolean ​
Checks if the given value is a boolean.
This function can also serve as a type predicate in TypeScript, narrowing the type of the argument to boolean.
Signature ​
typescript
function isBoolean(x: unknown): x is boolean;Parameters ​
x(unknown): The value to test if it is boolean.
Returns ​
(x is boolean): True if the value is boolean, false otherwise.
Examples ​
typescript
const value1 = true;
const value2 = 0;
const value3 = 'abc';
console.log(isBoolean(value1)); // true
console.log(isBoolean(value2)); // false
console.log(isBoolean(value3)); // false