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Lodash _.functionsIn


The lodash _.functionsIn method is a utility function that returns an array of all the function names of an object's inherited and own properties. This method provides a way to retrieve all of the function names for a given object, including those that may have been inherited from prototype chains.

One of the main uses for the _.functionsIn method is in Object Oriented Programming (OOP), where it can be used to gather information about the functions that an object can perform. This information can be used to create documentation, to help with debugging, and to ensure that objects are being used as intended.

The _.functionsIn method is part of the larger lodash library, which is a widely used utility library for JavaScript. To use the _.functionsIn method, you must first install lodash in your project using one of several methods, such as through package managers like npm or yarn.

Syntax: _.functionsIn(object)


  • object (Object): The object to inspect.

Returns: (Array): Returns the new array of property names.

Example usage:

const _ = require('lodash');

function MyClass() { = function() {}; = function() {}; }

MyClass.prototype.baz = function() {};

const instance = new MyClass();

console.log(_.functionsIn(instance)); // ["foo", "bar", "baz"]

In this example, we create a new MyClass function that has two properties (foo and bar), and a prototype property called baz. We then create a new instance of MyClass and pass it to the _.functionsIn method, which returns an array of all of its function names. The returned array includes the names of both inherited and own properties.

Overall, the lodash _.functionsIn method provides an easy and efficient way to retrieve all of the function properties of an object, making it a useful tool for developers working with OOP in JavaScript.