Object.keys() returns the keys (properties) of any object type. Object.values() returns the values of all object keys (properties). Object.entries() returns the keys and values of any object types.

Mar 6, 2025 · Object.keys() returns an array whose elements are strings corresponding to the enumerable string-keyed property names found directly upon object. This is the same as iterating with a for...in loop, except that a for...in loop enumerates properties in the prototype chain as well.

var obj = { 'bar' : 'baz' } var key = Object.keys(obj)[0]; var value = obj[key]; console.log("key = ", key) // bar console.log("value = ", value) // baz Object.keys() is a javascript method which return an array of keys when iterating over objects.

Jan 14, 2020 · There are two ways to add new properties to an object: key1: value1, key2: value2. The first form is used when you know the name of the property. The second form is used when the name of the property is dynamically determined. Like in this example: return obj[propertyName]; A real JavaScript array can be constructed using either: obj is an object.

Jun 27, 2021 · Object.keys (obj) – returns an array of keys. Object.values (obj) – returns an array of values. Object.entries (obj) – returns an array of [key, value] pairs. Please note the distinctions (compared to map for example): The first difference is that we have to call Object.keys(obj), and not obj.keys(). Why so? The main reason is flexibility.

In ECMAScript 2017, just call Object.entries(yourObj). In ECMAScript 2015, it is possible with Map s. In ECMAScript 5, it is not possible. ECMAScript 2017 introduced a new Object.entries function. You can use this to iterate the object as you wanted. console.log(key, value);

Nov 11, 2020 · This article will get you up and running with JavaScript objects: how to create an object ; how to store data in an object; and retrieve data from it. Let’s start by creating an object. How to Create an Object in JavaScript. I'll create an …

Sep 13, 2024 · To get a key in a JavaScript object by its value means finding the key associated with a specific value in an object. Given an object with key-value pairs, you want to identify which key corresponds to a particular value, often for searching or data retrieval. How to get a key in a JavaScript object by its value?

Dec 11, 2024 · JavaScript objects provide organized data storage by associating unique keys with values. Key-value pairs enable intuitive access and updates. In this comprehensive 4-part tutorial, you‘ll learn: With these core concepts mastered, you‘ll be prepared to …

Object.keys(obj) returns an array of a given object's own enumerable property names. This method proves incredibly useful when you need to process or analyze all the keys of an object. To access the values of an object's properties, Object.values(obj) is used. It returns an array of a given object's own enumerable property values.