iDevie
December 2021
M T W T F S S
 12345
6789101112
13141516171819
20212223242526
2728293031  

Categories


Navigating and managing data structures is a really important skill for every level of engineer to have and improve upon. Over the years, the JavaScript language has continued to provide more methods for managing data structures, from Object.keys to Object.values and so on. One of my favorites is Object.entries, an API that provides the keys and values via an array of arrays. Let’s have a look!

Consider the following object:

const obj = {
    name: "David",
    color: "green",
    balance: 100
}

Traditionally we’d have iterated over keys via a for loop, then use array syntax to get values:

const obj = {
    name: "David",
    color: "green",
    balance: 100
}

for (const key in obj) {
    const value = obj[key];
}

We do have Object.keys() and Object.values() to get each now, but neither method provides a relationship to the parent key or value. I really love using Object.entries to maintain that relationship and get both the key and value:

Object.entries({
    name: "David",
    color: "green",
    balance: 100
}).forEach(([key, value]) => console.log(key, value))

/*
name David
color green
balance 100
*/

Object.entries is such a useful method when you need both a key and value. Throw away those old for loops and Array-like syntaxes and use Object.entries like a pro!

  • fetch API

    One of the worst kept secrets about AJAX on the web is that the underlying API for it, XMLHttpRequest, wasn’t really made for what we’ve been using it for.  We’ve done well to create elegant APIs around XHR but we know we can do better.  Our effort to…

  • Chris Coyier’s Favorite CodePen Demos

    David asked me if I’d be up for a guest post picking out some of my favorite Pens from CodePen. A daunting task! There are so many! I managed to pick a few though that have blown me away over the past few months. If you…

  • AJAX Username Availability Checker Using MooTools 1.2
  • jQuery Link Nudging

    A few weeks back I wrote an article about MooTools Link Nudging, which is essentially a classy, subtle link animation achieved by adding left padding on mouseover and removing it on mouseout. Here’s how to do it using jQuery: The jQuery JavaScript It’s important to keep…


Comments 0
There are currently no comments.