Aug 24, 2017 An object in JavaScript is a data type that is composed of a collection of names or keys and values, represented in name:value pairs. The name:value pairs can consist of properties that may contain any data type — including strings, numbers, and Booleans — as well as methods, which are functions contained within an object. JavaScript Objects. ❮ Previous Next ❯. In real life, a car is an object. A car has properties like weight and color, and methods like start and stop: All cars have the same properties, but the property values differ from car to car. All cars have the same methods, but the methods are performed at different times.

1. Javascript Generate Dynamic Key Values In An Objects
2. Javascript Dynamic Object Name
3. Javascript Generate Dynamic Key Values In An Object Worksheet
4. Add Property To Javascript Object

You may have seen yourself in this situation when coding in JavaScript: you have an array of objects, and you need to find some specific object inside this array based on some property of the object. There are A LOT of ways of achieving this, so I decided to put some of them together in this post to make it easy for you to pick up whatever works best for you. Let's check them out!

First, let's say that we have this array of objects called 'objArray':

And let’s say that we want to get the object that has the id equal to 3, let’s see how we can achieve that.

Using Vanilla JS (aka plain old JavaScript)

If you want to use the plain old javascript you can create a function that iterates over the array and then return the object when the id matches with the one you’re looking for (or return null if it doesn’t find a matching result):

Then you can pass the array you want to lookup, the property you’re looking for and its value. In our case we would use it like this:

Javascript Generate Dynamic Key Values In An Objects

Using ES6

If you prefer using the newer ES6 functions, you can also use the built-in find function, so we can achieve the same result without the need to implement our own function to look up an object in an array:

DISCLAIMER: As basically everyone said in the comments, yes, you could use the filter function instead of find, it's equally simple, but the point of this article here is to get to know about the find function. If you don't know about the filter function and want to have a look on it instead, I also wrote this small article talking about it. =)

It makes thing easier than ever, HOWEVER, you should already know that ES6 is not supported by some older browsers, so you should pay a little attention to this. One of the things that you can do to avoid browser-compatibility problems when using ES6-only functions is to use an external javascript library such as Underscore.js, because such libraries implement ES6 functions in a way that allow us to use these functions without worrying about older browsers support (and as a plus, those kind of libraries may even have some additional cool functions too).

Using Underscore.js

If we opt to use Underscore.js, our code to find the object with the id equal to 3 changes to this:

Using jQuery

Maybe you already use jQuery in your project, and if that is the case, you can use jQuery’s grep function to achieve our desired result, it goes like this:

Using AngularJS $filter

If you’re already working with AngularJS, you can also use the $filter module to filter the array. Using AngularJS’s $filter, it looks like this:

Javascript Dynamic Object Name

Here’s a demo on jsFiddle for you to play around with.

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Javascript Generate Dynamic Key Values In An Object Worksheet

I hope you enjoyed this short post, keep up the good (and clean) code!

Add Property To Javascript Object

;)