Zak Dyer

Zak Dyer


12 tips for writing clean and scalable JavaScript

JavaScript has its origins in the early web. Starting out as a scripting language, it has now evolved into a fully fledged programming language with support for server-side execution.

Modern web applications rely heavily on JavaScript, especially single-page applications (SPAs). With emerging frameworks like React, AngularJS, and Vue.js, web apps are mainly built with JavaScript.

Scaling these applications — frontend equally as backend — can be quite tricky. With a mediocre setup, you will eventually hit limitations and get lost in a sea of confusion. I want to share a couple of small tips that will help you write clean code in an efficient way.

This article is geared towards JavaScript developers of any skill level. However, developers with at least intermediate knowledge of JavaScript will benefit most from these tips.

1. Isolate your code

The most important thing I can recommend to keep a codebase clean and readable is having specific chunks of logic (usually functions) separated by topic. If you write a function, the function should default to having only one purpose and should not do multiple things at once.

Also, you should avoid causing side effects, meaning in most cases, you should not change anything that is declared outside your function. You receive data into functions with parameters; everything else should not be accessed. If you wish to get something out of the function, return new values.

2. Modularization

Of course, you can group multiple functions into one module (and/or class, if you wish) if these functions are used in a similar way or do similar things. For example, if you have many different calculations to do, split them up into isolated steps (functions) that you can chain. However, these functions can all be declared in one file (module). Here is the example in JavaScript:

function add(a, b) {
    return a + b   

function subtract(a, b) {
    return a - b   

module.exports = {
const { add, subtract } = require('./calculations')

console.log(subtract(5, add(3, 2))

If you are writing frontend JavaScript, definitely make use of default exports for the most important items and named exports for secondary items.

3. Prefer multiple parameters over single object parameters

When declaring a function, you should always prefer multiple parameters over one parameter that expects an object:

function displayUser(firstName, lastName, age) {
    console.log(`This is ${firstName} ${lastName}. She is ${age} years old.`)

// BAD
function displayUser(user) {
    console.log(`This is ${user.firstName} ${user.lastName}. She is ${user.age} years old.`)

The reason behind this is that you know exactly what you need to pass to the function when you look at the first line of the function declaration.

Even though functions should be limited in size — doing only one job — it may happen that functions grow bigger in size. Scanning through the function body for the variables you need to pass (that are nested inside an object) will take you more time. Sometimes it might seem easier to just use the whole object and pass it to the function, but to scale your application, this setup will definitely help.

There is a certain point where declaring specific parameters does not make sense. For me, it is above four or five function parameters. If your function grows that big, you should pivot to use object parameters.

The main reason here is that parameters need to be passed in a specific order. If you have optional parameters, you need to pass undefined or null. With object parameters, you can simply pass the whole object, where order and undefined values do not matter.

4. Destructuring

Destructuring is a nice tool that was introduced with ES6. It lets you grab specific fields from an object and assign it to a variable immediately. You can use this for any kind of object or module.

const { add, subtract } = require('./calculations')

It does make sense to only import the functions you need to use in your file instead of the whole module, and then access the specific functions from it. Similarly, when you decide that you definitely need an object as function parameter, use destructuring as well. This will still give you the overview of what is needed inside the function:

function logCountry({name, code, language, currency, population, continent}) {
    let msg = `The official language of ${name} `
    if(code) msg += `(${code}) `
    msg += `is ${language}. ${population} inhabitants pay in ${currency}.`
    if(contintent) msg += ` The country is located in ${continent}`

    name: 'Germany',
    code: 'DE',
    language 'german',
    currency: 'Euro',
    population: '82 Million',

    name: 'China',
    language 'mandarin',
    currency: 'Renminbi',
    population: '1.4 Billion',
    continent: 'Asia',

As you can see, I still know what I need to pass to the function — even if it is wrapped in an object. To solve the problem of knowing what is required, see the next tip!

(By the way, this also works for React functional components.)

5. Use default values

Default values for destructuring or even basic function parameters are very useful. Firstly, they give you an example of what value you can pass to the function. Secondly, you can indicate which values are required and which are not. Using the previous example, the full setup for the function could look like this:

function logCountry({
    name = 'United States', 
    language = 'English', 
    currency = 'USD', 
    population = '327 Million', 
}) {
    let msg = `The official language of ${name} `
    if(code) msg += `(${code}) `
    msg += `is ${language}. ${population} inhabitants pay in ${currency}.`
    if(contintent) msg += ` The country is located in ${continent}`

    name: 'Germany',
    code: 'DE',
    language 'german',
    currency: 'Euro',
    population: '82 Million',

    name: 'China',
    language 'mandarin',
    currency: 'Renminbi',
    population: '1.4 Billion',
    continent: 'Asia',

Obviously, sometimes you might not want to use default values and instead throw an error if you do not pass a value. Oftentimes, however, this is a handy trick.

6. Data scarcity

The previous tips lead us to one conclusion: do not pass around data that you don’t need. Here, again, it might mean a bit more work when setting up your functions. In the long run, however, it will definitely give you a more readable codebase. It is invaluable to know exactly which values are used in a specific spot.

7. Line and indentation limit

I have seen big files — very big files. In fact, over 3,000 lines of code. Finding chunks of logic is incredibly hard in these files.

Therefore, you should limit your file size to a certain number of lines. I tend to keep my files below 100 lines of code. Sometimes, it is hard to break up files, and they will grow to 200–300 lines and, in rare occasions, up to 400.

Above this threshold, the file gets too cluttered and hard to maintain. Feel free to create new modules and folders. Your project should look like a forest, consisting of trees (module sections) and branches (groups of modules and module files). Avoid trying to mimic the Alps, piling up code in confined areas.

Your actual files, in comparison, should look like the Shire, with some hills (small levels of indentation) here and there, but everything relatively flat. Try to keep the level of indentation below four.

Maybe it is helpful to enable eslint-rules for these tips!

8. Use prettier

Working in a team requires a clear style guide and formatting. ESLint offers a huge ruleset that you can customize to your needs. There is also eslint --fix, which corrects some of the errors, but not all.

Instead, I recommend using Prettier to format your code. That way, developers do not have to worry about code formatting, but simply writing high-quality code. The appearance will be consistent and the formatting automatic.

9. Use meaningful variable names

Ideally, a variable should be named based on its content. Here are some guidelines that will help you declare meaningful variable names.


Functions usually perform some kind of action. To explain that, humans use verbs — convert or display, for example. It is a good idea to name your functions with a verb in the beginning, e.g., convertCurrency or displayUserName.


These will usually hold a list of items; therefore, append an s to your variable name. For example:

const students = ['Eddie', 'Julia', 'Nathan', 'Theresa']


Simply start with is or has to be close to natural language. You would ask something like, “Is that person a teacher?” → “Yes” or “No.” Similarly:

const isTeacher = true // OR false

Array functions

forEach, map, reduce, filter, etc. are great native JavaScript functions to handle arrays and perform some actions. I see a lot of people simply passing el or element as a parameter to the callback functions. While this is easy and quick, you should also name these according to their value. For example:

const cities = ['Berlin', 'San Francisco', 'Tel Aviv', 'Seoul']

cities.forEach(function(city) {


Oftentimes, you have to keep track of the ids of specific datasets and objects. When ids are nested, simply leave it as id. Here, I like to map MongoDB _id to simply id before returning the object to the frontend. When extracting ids from an object, prepend the type of the object. For example:

const studentId =

// OR
const { id: studentId } = student // destructuring with renaming

An exception to that rule is MongoDB references in models. Here, simply name the field after the referenced model. This will keep things clear when populating references documents:

const StudentSchema = new Schema({
    teacher: {
        type: Schema.Types.ObjectId,
        ref: 'Teacher',
        required: true,
    name: String,

10. Use async / await where possible

Callbacks are the worst when it comes to readability — especially when nested. Promises were a nice improvement, but async/await has the best readability, in my opinion. Even for beginners, or people coming from other languages, this will help a lot. However, make sure you understand the concept behind it and do not mindlessly use it everywhere.

11. Module import order

As we saw in tips 1 and 2, keeping logic in the right place is key to maintainability. In the same way, how you import different modules can reduce confusion in your files. I follow a simple structure when importing different modules:

// 3rd party packages
import React from 'react'
import styled from 'styled-components'

// Stores
import Store from '~/Store

// reusable components
import Button from '~/components/Button'

// utility functions
import { add, subtract } from '~/utils/calculate'

// submodules
import Intro from './Intro'
import Selector from './Selector'

I used a React component as an example here since there are more types of imports. You should be able to adapt that to your specific use case.

12. Get rid of console

console.log is a nice way of debugging — very simple, quick, and does the job. Obviously, there are more sophisticated tools, but I think every developer still uses it. If you forget to clean up logs, your console will eventually end up a giant mess. Then there is logs that you actually want to keep in your codebase; for example, warning and errors.

To solve this issue, you can still use console.log for debugging reasons, but for lasting logs, use a library like loglevel or winston. Additionally, you can warn for console statements with ESLint. That way you can easily globally look for console... and remove these statements.

Following these guidelines really helped me to keep my codebase clean and scalable. Are there any tips you find particularly useful? Let us know in the comments what you will include in your coding workflow, and please share any other tips you use to help with code structure!


What is GEEK

Buddha Community

12 tips for writing clean and scalable JavaScript
Ray  Patel

Ray Patel


top 30 Python Tips and Tricks for Beginners

Welcome to my Blog , In this article, you are going to learn the top 10 python tips and tricks.

1) swap two numbers.

2) Reversing a string in Python.

3) Create a single string from all the elements in list.

4) Chaining Of Comparison Operators.

5) Print The File Path Of Imported Modules.

6) Return Multiple Values From Functions.

7) Find The Most Frequent Value In A List.

8) Check The Memory Usage Of An Object.

#python #python hacks tricks #python learning tips #python programming tricks #python tips #python tips and tricks #python tips and tricks advanced #python tips and tricks for beginners #python tips tricks and techniques #python tutorial #tips and tricks in python #tips to learn python #top 30 python tips and tricks for beginners

Niraj Kafle


The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

#javascript-interview #javascript-development #javascript-fundamental #javascript #javascript-tips

Jackson George


ECS: Residential & Commercial Cleaning Services in London

Specializing in commercial cleaning, office cleaning, hospital & GP surgery cleaning, residential cleaning, washroom cleaning, school cleaning, Covid cleaning and sanitization, ECS Commercial Cleaning Company London has built up a large, experienced team of highly-skilled team of professionals who ensures work is delivered to highest standards, on time and on budget.

At ECS Commercial Cleaning, we provide a safe, cost-effective and efficient service that covers all your commercial cleaning needs. From residential cleaning, washroom cleaning, school cleaning to office cleaning, hospital & GP surgery cleaning, we cater it all. We have years of experience with all kinds of projects and know the best approach to save you time and money. Our professional knowledge and skills has enabled us to provide high quality cleaning solutions throughout London.

We’ve been delivering commercial cleaning services throughout London with the help of trained and experienced professionals, using only the finest equipment and cleaning solutions. Our team starts cleaning project from initial consultation through to completion on budget and schedule.

ECS Commercial Cleaning strives to keep people first, investing in their professional training and safety. We work hard to create and sustain an environment that helps us to achieve clients’ expectations through consistently excellent service and minimal downtime.

Our Services

With 10 years of market experience, a resource of professional employees and coverage throughout the London, ECS Commercial Cleaning has established itself as one of the leading commercial cleaning company, offering valuable cleaning solutions including:

  • commercial cleaning
  • office cleaning
  • hospital & GP surgery cleaning
  • residential cleaning
  • washroom cleaning
  • school cleaning
  • covid cleaning and sanitization

Our clients are the London’s leading retail outlets, office buildings and office premises, schools, hospitals, production and industrial premises and others. Our cleaning solutions offers peace of mind to clients and most importantly ensure that workers are able to do their jobs comfortably and efficiently without compromising safety. Over the years of industry experience, we remain at the forefront of our industry due to our unparalleled customer dedication and unrivalled experience in providing safe, and cost-effective cleaning solutions.

Our Expert Team

ECS Commercial Cleaning provides you with an expert team that completes your cleaning project professionally and efficiently. No matter what cleaning service you require, our aim is to work closely with our clients in order to comprehend their needs and fulfil their specific requirements through tailored cleaning solutions.

With our eco-friendly cleaning products and a team of experienced professionals, we can provide timely cleaning solutions to our clients. Contact ECS Commercial Cleaning on 0161 5462235.

#cleaning #commercial cleaning #office cleaning #residential cleaning #washroom cleaning #covid cleaning and sanitization

Kaustav Hazra


How to start writing less error-prone code in JavaScript

Everything in JavaScript is an object!’. We said that this assertion is false. Many things in JavaScript can behave like an object, but that doesn’t mean it’s the object. We can say we have three types of objects (objects, functions and arrays) in JavaScript.

In ECMAScript Specification, the functions aren’t on the type list. Intuitively, function values have a specific behaviour, that is different from values that are numbers - so isn’t it a type? JavaScript refers to functions as a sub-type of the object type - sometimes refers to them as a callable object.

Conclusion: Functions are sort of type, but a sub-type - not a top level type…

#javascript-development #javascript-tips #programming-tips #javascript #programming

Armando  Bruen

Armando Bruen


Who Else Wants to Write Clean JavaScript Code?

Your college: “Who’s the author of this code?”

Expectation: “It’s me!” You answer proudly because that code is beautiful like a princess.

Reality: “Nah, it’s not me!” You lie because that code is ugly like a beast.

Now, if you want to make the expectation become the reality, keep reading.

1. Use meaningful Variable Names

Use meaningful names, which you know exactly what it is at first glance.

// Don't
let xyz = validate(‘amyjandrews’);

// Do
let isUsernameValid = validate(‘amyjandrews’);

It makes sense to name a collection type as plural. Thus, don’t forget the s:

// Don't
let number = [3, 5, 2, 1, 6];

// Do
let numbers = [3, 5, 2, 1, 6];

Functions do things. So, a function’s name should be a verb.

// Don't
function usernameValidation(username) {}

// Do
function validateUsername(username) {}

Start with is for boolean type:

let isValidName = validateName(‘amyjandrews’);

Don’t use constants directly because as time pass you will be like, “What the hell is this?” It’d better to name constants before using them:

// Don't
let area = 5 * 5 * 3.14;

// Do
const PI = 3.14;
let area = 5 * 5 * PI;

For callback functions, don’t be lazy to just name parameters as one character like h, j, d (maybe even you, the father of those name, don’t know what they mean). Long story short, if the parameter is a person, pass person; if it’s a book, pass book:

// Don't
let books = [‘Learn JavaScript’, ‘Coding for Beginners’, ‘CSS the Good Parts’];

books.forEach(function(b) {
  // …
// Do
let books = [‘Learn JavaScript’, ‘Coding for Beginners’, ‘CSS the Good Parts’];
books.filter(function(book) {
  // …

#coding #javascript-tips #programming #javascript #javascript-development