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I was recently mentoring someone who had trouble with the .reduce() method in JavaScript. Namely, how you get from this:

const nums = [1, 2, 3]
let value = 0

for (let i = 0; i < nums.length; i++) {
value += nums[i]
}

…to this:

const nums = [1, 2, 3]
const value = nums.reduce((ac, next) => ac + next, 0)

They are functionally equivalent and they both sum up all the numbers in the array, but there is …

The post Understanding the Almighty Reducer appeared first on CSS-Tricks.

Part of the job of being a front-end developer is applying different techniques and technologies to pull of the desired UI and UX. Perhaps you work with a design team and implement their designs. I know when I look at a design (heck, even if I know I’m not going to be building it), my front-end brain starts triggering all sorts of things I know will be related to the task.

Let’s take a look at what I mean.…

The post Your Brain on Front-End Development appeared first on CSS-Tricks.

Like many, many others, I’m in the pool of leveling up my JavaScript skills and learning how to put React to use. That’s why Brad Frost resonated with me when he posted My Struggle to Learn React.”

As Brad does, he clearly outlines his struggles point-by-point:

• I have invested enough time learning it
• React and ES6 travel together
• Syntax and conventions
• Getting lost in this-land
• I haven’t found sample projects or tutorials that match how i tend to work

…

The post A Quick Roundup of Recent React Chatter appeared first on CSS-Tricks.

If you’re looking for more manageable ways to create bar graphs, or in search of use cases to practice CSS Grid layout, I got you!

Before we begin working on the graph, I want to talk about coding the bars, when Grid is a good approach for graphs, and we’ll also cover some code choices you might consider before getting started.

Preface

The bar is a pretty basic shape: you can control its dimensions with CSS width, height, …

The post Creating a Bar Graph with CSS Grid appeared first on CSS-Tricks.

(This is a sponsored post.)

Interestingly, one of the most important areas of a blog post is the comment section. This plays an important role in the success of a post or an article, as it allows proper interaction and participation from readers. This makes it inevitable for every platform with a direct comments system to handle it in realtime.

In this post, we’ll build an application with a live comment feature. This will happen in realtime as …

The post ​​Build live comments with sentiment analysis using Nest.js appeared first on CSS-Tricks.