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Lawrence Aberba


A generalist full stack developer, open source contributor and an avid Linux user


Simplistic JavaScript coding style with ES6

JavaScript

Recently, JavaScript has played huge role in projects I’ve been working on more than ever. EcmaScript 6 (ES6) has made JavaScript much appealing than it already was, for both front-end and back-end development.

JavaScipt is everywhere!

Almost all major cloud vendors support JavaScript (NodeJS ) as first class language and have official SDKs written for it. I’ve been using JavaScript intensively since the ES5 days but I never bothered to write anything about it since none seemed interesting.

Did I just say “ES5 days” like it was centuries ago?

Some interesting and simplistic coding styles I’ve been using recently have proved quite productive. Below are some few:

Destructuring

This syntactic sugar makes is much cleaner to access properties of an object and arrays.

let user = { name: "Samuel Adongo", age: 28 };
const { name, age } = user;
console.log(name, age);

Function parameters and arguments can also be made more self-documenting using destructuring, a common pattern used in React ES6 code. Template literals are also more readable compared to concatenation.

function fetchUser({ name, age }) {
    console.log(`fetching ${name} of age ${age}`);
}

const name = "Samuel Adongo";
const age = 28;
fetchUser({ name: name, age: age });

The function call can even be simplified as so:

fetchUser({ name, age });

Object destructuring can be used in module imports as well:

import React, { Component } from "react";

Async & Await

Async/await provides a more readable and easy-to-reason-about way of writing asynchronous code: making it look synchronous in syntax. Combining this with the fetch API makes async requests simplistic.

(async () => {
    const response = await fetch("https://example.com/json");
    const data = await response.json();
    console.log(data);
})();

This also minimizes the use of the then and catch style of Promises. By the way, anonymous function with fat arrow syntax is very useful when writing simplistic code.

Code Simplicity!

Spread syntax

Expanding an object to construct a new object or expanding an array as arguments to a function has never been simpler with spread syntax:

let data = { name: "Samuel Adongo", age: 28 };

// prints { name: 'Samuel Adongo', age: 28, weight: 75 }
console.log({ ...data, weight: 75 });



function sum(x, y, z) {
  return x + y + z;
}

const numbers = [1, 2, 3];
console.log(sum(...numbers)); // prints 6

Some functional programming

Array methods such as filter, map, reduce, sort, reverse, every, find, includes, forEach, keys, entries and many already existing ones serve as convenient functions for performing common task.

const numbers = [1, 2, 3, 4, 5];
console.log(
    numbers
        .map(number => number * 2) // multiply each by 2
        .filter(number => number % 2 == 0) // select only even numbers
        .reverse() // reverse array in descending order
);

These are just few of the goodies in ES6 that has made coding in JavaScipt more productive for me.

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