Use These Methods to Iterate Over Objects Easily in JavaScript

Use These Methods to Iterate Over Objects Easily in JavaScript

Objects are the weirdest method of data collection in JavaScript, and they are likely the most used one, even though you might think that it might be arrays. Use These Methods to Iterate Over Objects Easily in JavaScript. How can I iterate through a JS object?

Objects are the weirdest method of data collection in JavaScript, and they are likely the most used one, even though you might think that it might be arrays. The core of JavaScript and how we treat data is all about objects.

Everything can be treated as an object in JavaScript. Remember how many methods you have used to manipulate strings, how many arrays methods you have worked with, or how you’ve been creating objects through functions.

I’m not saying that in a fancy way. Create a function, array, and an object, then test if they are instances of an object by using the instanceof operator as I did in the example below. The result will blow your mind.

Using the instanceof operator to check if functions, arrays are instance of an object. Everything is an object in JavaScript

First Example

Objects methods.

The first time I learned how to use objects, I had the question that any JavaScript developer had when they learned about objects — how can I iterate over an object? Well, the answer was using the for in loop. Iterating over an object was a little bit weird and confusing compared to arrays.

Using the for in loop for a beginner would be confusing on the first try, because you’ll mix between getting the values of keys and the names of keys, plus you might fall in the trap of mutating the object while iterating over it.

Built-in objects methods took the burden of writing a for in loop just to get the keys or values of an object, so instead of stocking the values of object properties inside an array using the for in loop with three lines, we can do the same in a single line with the Object.values() method.

programming front-end-development javascript coding

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