isFunction
Checks if value is a function.
This function returns true if value is a function, and false otherwise.
This function can also serve as a type predicate in TypeScript, narrowing the type of the argument to a function.
Signature
typescript
function isFunction(value: unknown): value is (...args: never[]) => unknown;Parameters
value(unknown): The value to check if it is a function.
Returns
(value is (...args: never[]) => unknown): Returns true if the value is a function, otherwise false.
Examples
typescript
import { isFunction } from 'es-toolkit/predicate';
console.log(isFunction(Array.prototype.slice)); // true
console.log(isFunction(async function () {})); // true
console.log(isFunction(function* () {})); // true
console.log(isFunction(Proxy)); // true
console.log(isFunction(Int8Array)); // true