functionsIn

INFO

This function is only available in es-toolkit/compat for compatibility reasons. It either has alternative native JavaScript APIs or isn't fully optimized yet.

When imported from es-toolkit/compat, it behaves exactly like lodash and provides the same functionalities, as detailed @here.

Returns an array of property names whose values are functions, including inherited properties.

Signature

// When object is any type
function functionsIn(object: any): string[];

Parameters

• object: The object to inspect.

Returns

(string[]): Returns the array of function property names from both own and inherited enumerable properties of the object.

Examples

import { functionsIn } from 'es-toolkit/compat';

function Foo() {
  this.a = function () {
    return 'a';
  };
  this.b = function () {
    return 'b';
  };
}

Foo.prototype.c = function () {
  return 'c';
};

// Get function property names including inherited ones
functionsIn(new Foo());
// => ['a', 'b', 'c']

// Works with plain objects
const object = {
  a: function () {
    return 'a';
  },
  b: function () {
    return 'b';
  },
};

functionsIn(object);
// => ['a', 'b']

// Returns empty array for non-objects
functionsIn(null);
// => []
functionsIn(undefined);
// => []
functionsIn(1);
// => []