Iterate over the own and inherited enumerable properties of an object, and return an object with properties that evaluate to true from the callback. Exit early by returning `false`. JavaScript/Node.js
The 'for-in' npm package is a utility that allows you to iterate over the properties of an object in JavaScript. It provides a simple and efficient way to loop through object keys, even for objects that inherit properties from their prototype.
Iterating over object properties
This feature allows you to loop through each property of an object. The function provided to forIn is called with each property's value and key. This is particularly useful for objects with enumerable properties.
const forIn = require('for-in');
const object = {a: 1, b: 2, c: 3};
forIn(object, function(value, key) {
console.log(key + ': ' + value);
});Lodash's forEach method is similar to for-in but offers more extensive functionality, such as iterating over arrays, objects, and other collection types. It also supports exiting the iteration early by returning false, which is not supported by for-in.
This is not an npm package but a built-in JavaScript method that returns an array of a given object's own enumerable string-keyed property [key, value] pairs. This can be used in combination with forEach for similar functionality to for-in but requires conversion to an array first.
Iterate over the own and inherited enumerable properties of an object, and return an object with properties that evaluate to true from the callback. Exit early by returning
false. JavaScript/Node.js
Install with npm:
$ npm install --save for-in
var forIn = require('for-in');
var obj = {a: 'foo', b: 'bar', c: 'baz'};
var values = [];
var keys = [];
forIn(obj, function (value, key, o) {
keys.push(key);
values.push(value);
});
console.log(keys);
//=> ['a', 'b', 'c'];
console.log(values);
//=> ['foo', 'bar', 'baz'];
Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
| Commits | Contributor |
|---|---|
| 16 | jonschlinkert |
| 2 | paulirish |
(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)
To generate the readme, run the following command:
$ npm install -g verbose/verb#dev verb-generate-readme && verb
Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
$ npm install && npm test
Jon Schlinkert
Copyright © 2017, Jon Schlinkert. Released under the MIT License.
This file was generated by verb-generate-readme, v0.4.2, on February 28, 2017.
FAQs
Iterate over the own and inherited enumerable properties of an object, and return an object with properties that evaluate to true from the callback. Exit early by returning `false`. JavaScript/Node.js
The npm package for-in receives a total of 12,664,830 weekly downloads. As such, for-in popularity was classified as popular.
We found that for-in demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Research
Security News
Socket’s threat research team has detected six malicious npm packages typosquatting popular libraries to insert SSH backdoors.
Security News
MITRE's 2024 CWE Top 25 highlights critical software vulnerabilities like XSS, SQL Injection, and CSRF, reflecting shifts due to a refined ranking methodology.
Security News
In this segment of the Risky Business podcast, Feross Aboukhadijeh and Patrick Gray discuss the challenges of tracking malware discovered in open source softare.