isFunction#

Check if the given value is a function.

Usage Scenarios#

• Callback Validation: Verify a callback is a function before invoking it.
• Higher-Order Functions: Check if a parameter is a function before composition.
• Event Handlers: Ensure event handlers are properly set.

Examples#

import { isFunction } from 'funtool';

isFunction(() => {}); // ✅ true
isFunction(function() {}); // ✅ true
isFunction(class {}); // ✅ true

isFunction({}); // ❌ false
isFunction('function'); // ❌ false

Signature#

function isFunction(v: any): v is Function

Parameters#

• v (any): The value to test if it is a function.

Returns#

• (v is Function): Returns true if the value is a function, otherwise returns false.