The Ultimate Guide to Unit Testing in JavaScript.

A Thread...

"A unit test should test the behavior of a unit of work."

Unit tests are isolated and independent of each other.

- Any given behavior should be specified in one and only one test

- The execution/order of execution of one test cannot affect the others

- Repeatable

- Fast

"Ultimate Guidelines Which Helped Me a Lot."

- Whenever possible, use TDD

- Structure your tests properly

- Name your tests properly

- Don't comment out tests

- Avoid logic in your tests

- Don't write unnecessary expectations

- Know your testing framework API

- Consider using factory functions in the tests

- Don't test multiple concerns in the same test

- Cover the general case and the edge cases

- Test the behavior, not the internal implementation

- Don't mock everything

- Create new tests for every defect

- Test simple actions

- Review test code first

- When applying TDD, always start by writing the simplest failing test

- When applying TDD, always make small steps in each test-first cycle

- Properly set up the actions that apply to all the tests involved

Remember "Unit tests are code too"

10 Awesome Github Repos 🧵

1. You-Dont-Know-JS
A book series on JavaScript. @YDKJS on

2.Frontend Dev Bookmarks
This is a manually curated collection of resources for front-end web

3. Free Programming Books
This is a repo with all free programming books that are

4. JavaScript Algorithms
This is a list with algorithms and data structures implemented in JavaScript with explanations and links to further

Are you a Front-end developer?

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Important JavaScript Topics 👇🏻
🧵

1. JavaScript Spread Operator Explained
📌

2. JavaScript Reduce Method Explained
📌

3. JavaScript Filter Method Explained
📌

4. JavaScript Strict Mode Explained
📌

Css code generator websites 🔥
A thread 🧵👇

📌 Glassmorphism
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📌 Css3generator
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7 meta tags to improve the optimization of your site.

A Thread 👇

Why Meta tags are important?

-Meta tags are invisible tags that provide data about your page to search engines and website visitors.
-They can be optimized to highlight the most important elements of your content and make your website stand out in search results.

1️⃣ Title tag

Title tags are used by search engines to determine the subject of a page and are one of the first things that users notice in the SERPs.

Try to keep your title tag clear, descriptive, and usually not more than 55 characters.

2️⃣ Meta description

It is usually the element that determines whether users will click on your page, which makes it important to spend time on its optimization.

Use your meta description wisely and take advantage of the opportunity to provide more details about your content.

3️⃣ Robots meta tag

The meta robots tag tells search engines if and how they should crawl your web pages.

Use the robots meta tag to ensure that search crawlers process each page the way you want them to.

Everything you need to know about useState hook of React

A beginner's guide

Thread🧵👇

Hey👋

Hooks are powerful but confusing. Don't worry, I'll try to explain each hook in the easiest way in this thread series of React hooks

Let's start with useState, the most useful and simple hook in my opinion

Working with React hooks, first thing you need to do is to import the particular hook

It's quite easy👇

📌 import { useState } from "react";

useState hook takes a parameter as initial value of state and return an array having two values

- The first value is the current state
- The second value is the function that allow us to change our state

Let me show you the return value by printing it out on console👇

Now we know what useState hook return, it's time to destruct our value

const [currentState, setCurrentState] = useState(0);

🔹 currentState is the value of our state
🔹 setCurrentState is the function using which we can change our state value

React Hooks are so powerful and especially some additional hooks.

Do you know there is an alternative to useState called useReducer hook? It is used to manage more complex states.

Let's look into detail 🧵👇🏻

Usually, the useState hook is used to tackle states in React where you can pass the initial state and React preserves state for you between re-renders

What if you need to manage more complex states? Here useReducers comes into play

Similar to useState, the useReducer hook also returns a pair of values. Let's see what these two things are

The first value is `undefined` which is the current state (it is undefined because we didn't pass any initial state in the useReducer hook)

The second value is a dispatch function using which we can update our state.

The useReducer hook accepts 3 parameter

1. reducer
2. Initial state
3. init

React Hooks are the functions which "hook into" React state and lifecycle features from function components. Hooks allows you to manipulate state and other React feature without writing a class. Let's talk about widely used hook

useEffect hook at a glance 🧵👇🏻

useEffect hook is the heart of React functional components

If you're familiar with class components then you might know that we have various lifecycle methods but in functional components, we don't have any lifecycle methods. Instead we have a powerful hook called useEffect

By using useEffect, you tell React that your component needs to do something after render. React will remember the function you passed (we'll refer to it as our “effect”), and call it later after performing the DOM updates

So let's start by understanding the syntax first

3/15

useEffect take two parameters, first is a function and second is an array.

The function inside the useEffect will run every single time component re-render. Consider this piece of code and check the output in next tweet

{ 4 / 15 }

As you can see in the output the function is executed every single time my component re-render

{ 5 / 15 }

How to Get Rich (without getting lucky):

Seek wealth, not money or status. Wealth is having assets that earn while you sleep. Money is how we transfer time and wealth. Status is your place in the social hierarchy.

Understand that ethical wealth creation is possible. If you secretly despise wealth, it will elude you.

Ignore people playing status games. They gain status by attacking people playing wealth creation games.

You’re not going to get rich renting out your time. You must own equity - a piece of a business - to gain your financial freedom.