Debbie Clay

Debbie Clay


React v16+ Cheat Sheet (PDF/JPG/Custom themes)

Sometimes, it can take 30 minutes to create a quick interface using React. But other times, it can take hours.

If you often forget the names of methods, properties, or the functionality they provide, it can become irritating to have to leave your code editor just for a Google search. You may be thinking, is it really that hard to type in a couple of letters and get the answers you want? Well, absolutely not. But if this happens more than once, then maybe it’s time to acquire a cheat sheet so that you don’t have to leave your code editor anymore. Having a cheat sheet next to you will certainly save you some time in the long run!

Here’s a cheat sheet you can use:

While you’re looking at the cheat sheet, just keep in mind that you can:

1. Generate the cheat sheet into a downloadable PDF/JPEG, or you can bookmark the page and come back to it at a later time.

2. If you don't like how the columns are ordered, you can drag and re-order them before you generate the cheat sheet.

3. You can select any of the code syntax themes in the select box to generate in the cheat sheet (there are about 25 themes you can choose from):

I’ll go ahead and put this in a public repo if anyone needs it. I also just began this yesterday, and so it may not be a perfect cheat sheet yet.

Also, my goal was to fit all of this into one page, but there was too much information. If anyone has any suggestions on which parts to swap/remove, feel free to let me know.

The changes will also stay after you close your browser so that you don’t have to redo everything. Here’s a full list of what’s in the cheat sheet so far (I will keep updating the cheat sheet over time).


// Does not support key attribute
const App = () => (
    <MyComponent />
// Supports key attribute
const App = () => (
  <React.Fragment key="abc123">
    <MyComponent />

Return Types

const App = () => 'a basic string' // string
const App = () => 1234567890 // number
const App = () => true // boolean
const App = () => null // null
const App = () => <div /> // react element
const App = () => <MyComponent /> // component
const App = () => [
  // array
  'a basic string',
  <div />,
  <MyComponent />,

Error Boundary (React v16.0)

class MyErrorBoundary extends React.Component {
  state = { hasError: false }
  componentDidCatch(error, info) {...}
  render() {
    if (this.state.hasError) return <SomeErrorUI />
    return this.props.children

const App = () => (
<Main />

Static Methods

// Returning object = New props require state update
// Returning null = New props do not require state update
class MyComponent extends React.Component {
static getDerivedStateFromProps(props, state) {…}
state = {…}

// Return value is passed as 3rd argument to componentDidUpdate
class MyComponent extends React.Component {
static getSnapshotBeforeUpdate(prevProps, prevState) {…}

// Listening to context from a class component
import SomeContext from ‘…/SomeContext’
class MyCompmonent extends React.Component {
static contextType = SomeContext
componentDidMount() { console.log(this.context) }

// Enables rendering fallback UI before render completes
class MyComponent extends React.Component {
state getDerivedStateFromError() {…}
state = { error: null }
componentDidCatch(error, info) {…}

Component States

// Class component state
class MyComponent extends React.Component {
state = { loaded: false }
componentDidMount = () => this.setState({ loaded: true })
render() {
if (!this.state.loaded) return null
return <div {…this.props} />

// Function component state (useState/useReducer)
const MyComponent = (props) => {
// With useState
const [loaded, setLoaded] = React.useState(false)
// With useReducer
const [state, dispatch] = React.useReducer(reducer, initialState)
if (!loaded) return null
React.useEffect(() => void setLoaded(true))
return <div {…props} />

Rendering Components

// Ways to render Card
const Card = (props) => <div {…props} />

const App = ({ items = [] }) => {
const renderCard = (props) => <Card {…props} />
// or return => renderCard(props))

const App = (props) => <Card {…props} />

class App extends React.Component {
render() {
return <Card {…this.props} />

const MyComp = ({ component: Component }) => <Component />
const App = () => <MyComp component={Card} />

Default Props

// Function component
const MyComponent = (props) => <div {…props} />
MyComponent.defaultProps = { fruit: ‘apple’ }

// Class component
class MyComponent extends React.Component {
static defaultProps = { fruit: ‘apple’ }

render() {
return <div {…this.props} />

Other React Exports

// createContext (React v16.3)
const WeatherContext = React.createContext({ day: 3 })

const App = ({ children }) => {
const [weather, setWeather] = React.useState(null)
const [error, setError] = React.useState(null)

React.useEffect(() => {
}, [])

const contextValue = { weather, error }

return (
<WeatherContext.Provider value={contextValue}>
const SomeChild = () => {
const { weather } = React.useContext(WeatherContext)
return null

// createRef (Obtain a reference to a react node) (React v16.3)
const App = () => {
const ref = React.createRef()
React.useEffect(() => { console.log(ref.current) }, [])
return <div ref={ref} />

// forwardRef (Pass the ref down to a child) (React v16.3)
const Remote = React.forwardRef((props, ref) => (
<div ref={ref} {…props} />

const App = () => {
const ref = React.createRef()
return <Remote ref={ref} />

// memo (Optimize your components to avoid wasteful renders) (React v16.6)
const App = () => {…}
const propsAreEqual = (props, nextProps) => {
return ===
} // Does not re-render if id is the same
export default React.memo(App, propsAreEqual)


// default export
const App = (props) => <div {…props} />
export default App
import App from ‘./App’

// named export
export const App = (props) => <div {…props} />
import { App } from ‘./App’

Pointer Events (React v16.4)

onPointerUp           onPointerDown
onPointerMove onPointerCancel
onGotPointerCapture onLostPointerCapture
onPointerEnter onPointerLeave
onPointerOver onPointerOut

const App = () => {
const onPointerDown = (e) => console.log(e.pointerId)
return <div onPointerDown={onPointerDown} />

React Suspense/Lazy (React v16.6)

// lazy -> Dynamic import. Reduces bundle size
// + Code splitting
const MyComponent = React.lazy(() => import('./MyComponent))
const App = () => <MyComponent />

// Suspend rendering while components are waiting for something
// + Code splitting
import LoadingSpinner from ‘…/LoadingSpinner’

const App = () => (
<React.Suspense fallback={<LoadingSpinner />}>
<MyComponent />

React Profiler (React v16.9)

const App = () => (
<MyComponent />
<OtherComponent />

Synchronous / Asynchronous act Test Utility (React v16.9)

import { act } from ‘react-dom/test-utils’
import MyComponent from ‘./MyComponent’

const container = document.createElement(‘div’)

// Synchronous
it(‘renders and adds new item to array’, () => {
act(() => {
ReactDOM.render(<MyComponent />, container)
const btn = container.querySelector(‘button’)
expect(btn.textContent).toBe(‘one item’)
act(() => {
button.dispatchEvent(new MouseEvent(‘click’, { bubbles: true }))
expect(btn.textContent).toBe(‘two items’)

// Asynchronous
it(‘does stuff’, async () => {
await act(async () => {
// code

Check out the cheat sheet here.


And that’s the end of this post! I hope you found this to be useful and lookout for more in the future!

Thanks for reading

If you liked this post, share it with all of your programming buddies!

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Further reading about React, Redux and Django

React - The Complete Guide (incl Hooks, React Router, Redux)

Modern React with Redux [2019 Update]

Best 50 React Interview Questions for Frontend Developers in 2019

JavaScript Basics Before You Learn React

Microfrontends — Connecting JavaScript frameworks together (React, Angular, Vue etc)

Reactjs vs. Angularjs — Which Is Best For Web Development

React + TypeScript : Why and How

How To Write Better Code in React

React Router: Add the Power of Navigation

Getting started with React Router

Using React Router for optimizing React apps

Creating RESTful APIs with NodeJS and MongoDB Tutorial

#reactjs #javascript #web-development

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React v16+ Cheat Sheet (PDF/JPG/Custom themes)
Autumn  Blick

Autumn Blick


How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

  • Performance: It delivers optimal performance.
  • Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
  • UI design: React Native enables you to design simple and responsive UI for your mobile app.
  • 3rd party plugins: This framework supports 3rd party plugins.
  • Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

  • Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
  • Near-native user experience: React Native provides several native components, and these are platform agnostic.
  • The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

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Cayla  Erdman

Cayla Erdman


Introduction to Structured Query Language SQL pdf

SQL stands for Structured Query Language. SQL is a scripting language expected to store, control, and inquiry information put away in social databases. The main manifestation of SQL showed up in 1974, when a gathering in IBM built up the principal model of a social database. The primary business social database was discharged by Relational Software later turning out to be Oracle.

Models for SQL exist. In any case, the SQL that can be utilized on every last one of the major RDBMS today is in various flavors. This is because of two reasons:

1. The SQL order standard is genuinely intricate, and it isn’t handy to actualize the whole standard.

2. Every database seller needs an approach to separate its item from others.

Right now, contrasts are noted where fitting.

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Mathew Rini


How to Select and Hire the Best React JS and React Native Developers?

Since March 2020 reached 556 million monthly downloads have increased, It shows that React JS has been steadily growing. React.js also provides a desirable amount of pliancy and efficiency for developing innovative solutions with interactive user interfaces. It’s no surprise that an increasing number of businesses are adopting this technology. How do you select and recruit React.js developers who will propel your project forward? How much does a React developer make? We’ll bring you here all the details you need.

What is React.js?

Facebook built and maintains React.js, an open-source JavaScript library for designing development tools. React.js is used to create single-page applications (SPAs) that can be used in conjunction with React Native to develop native cross-platform apps.

React vs React Native

  • React Native is a platform that uses a collection of mobile-specific components provided by the React kit, while React.js is a JavaScript-based library.
  • React.js and React Native have similar syntax and workflows, but their implementation is quite different.
  • React Native is designed to create native mobile apps that are distinct from those created in Objective-C or Java. React, on the other hand, can be used to develop web apps, hybrid and mobile & desktop applications.
  • React Native, in essence, takes the same conceptual UI cornerstones as standard iOS and Android apps and assembles them using React.js syntax to create a rich mobile experience.

What is the Average React Developer Salary?

In the United States, the average React developer salary is $94,205 a year, or $30-$48 per hour, This is one of the highest among JavaScript developers. The starting salary for junior React.js developers is $60,510 per year, rising to $112,480 for senior roles.

* React.js Developer Salary by Country

  • United States- $120,000
  • Canada - $110,000
  • United Kingdom - $71,820
  • The Netherlands $49,095
  • Spain - $35,423.00
  • France - $44,284
  • Ukraine - $28,990
  • India - $9,843
  • Sweden - $55,173
  • Singapore - $43,801

In context of software developer wage rates, the United States continues to lead. In high-tech cities like San Francisco and New York, average React developer salaries will hit $98K and $114per year, overall.

However, the need for React.js and React Native developer is outpacing local labour markets. As a result, many businesses have difficulty locating and recruiting them locally.

It’s no surprise that for US and European companies looking for professional and budget engineers, offshore regions like India are becoming especially interesting. This area has a large number of app development companies, a good rate with quality, and a good pool of React.js front-end developers.

As per Linkedin, the country’s IT industry employs over a million React specialists. Furthermore, for the same or less money than hiring a React.js programmer locally, you may recruit someone with much expertise and a broader technical stack.

How to Hire React.js Developers?

  • Conduct thorough candidate research, including portfolios and areas of expertise.
  • Before you sit down with your interviewing panel, do some homework.
  • Examine the final outcome and hire the ideal candidate.

Why is React.js Popular?

React is a very strong framework. React.js makes use of a powerful synchronization method known as Virtual DOM, which compares the current page architecture to the expected page architecture and updates the appropriate components as long as the user input.

React is scalable. it utilises a single language, For server-client side, and mobile platform.

React is steady.React.js is completely adaptable, which means it seldom, if ever, updates the user interface. This enables legacy projects to be updated to the most new edition of React.js without having to change the codebase or make a few small changes.

React is adaptable. It can be conveniently paired with various state administrators (e.g., Redux, Flux, Alt or Reflux) and can be used to implement a number of architectural patterns.

Is there a market for React.js programmers?
The need for React.js developers is rising at an unparalleled rate. React.js is currently used by over one million websites around the world. React is used by Fortune 400+ businesses and popular companies such as Facebook, Twitter, Glassdoor and Cloudflare.

Final thoughts:

As you’ve seen, locating and Hire React js Developer and Hire React Native developer is a difficult challenge. You will have less challenges selecting the correct fit for your projects if you identify growing offshore locations (e.g. India) and take into consideration the details above.

If you want to make this process easier, You can visit our website for more, or else to write a email, we’ll help you to finding top rated React.js and React Native developers easier and with strives to create this operation

#hire-react-js-developer #hire-react-native-developer #react #react-native #react-js #hire-react-js-programmer

What are hooks in React JS? - INFO AT ONE

In this article, you will learn what are hooks in React JS? and when to use react hooks? React JS is developed by Facebook in the year 2013. There are many students and the new developers who have confusion between react and hooks in react. Well, it is not different, react is a programming language and hooks is a function which is used in react programming language.
Read More:-

#react #hooks in react #react hooks example #react js projects for beginners #what are hooks in react js? #when to use react hooks

Servo Node

Servo Node


Beginner’s Guide To Use WordPress Theme Customizer (Ultimate Guide 2021) › Servo Node

This tutorial or guide to use WordPress Theme Customizer is for those who’s a newbie to WordPress and just finished installing WordPress for his website. Selecting a suitable theme for your brand and requirement, is the very first step to create an attractive website. But even after the theme is selected, how further customization and website designing should be performed? Here what the WordPress Theme Customizer and its usage can be helpful.

What is WordPress Theme Customizer?
WordPress Theme Customizer is WordPress in-built feature that allows users to design and style their WordPress website. Also, it offers to preview any changes before publishing the design changes to front end. So, no matters you have selected the best theme for your brand, you need to do some refinements as well to meet your proper purposes. And in order to do so, you should aware of how to use WordPress theme customizer.

Where to locate WordPress Theme Customizer in Dashboard?
WordPress website offers a standard theme customizer as it comes as a built-in feature. In order to access it, users can log-in to WordPress dashboard with admin (Administrator) account. Once logged in, navigate to Appearance > Customize, which can be located in the left hand sidebar of dashboard. Once you click Customize, it will open WordPress theme customizer with current active theme.

WordPress Theme Customizer Options Explained:
Typography: Used for changing font settings and typography styles
Site Identity: Here, users can assign a site title, tagline, and upload site logo, icon, and so on.
Colors: Used for changing color preferences like background color, link color, etc.
Header Image: Under this section, user can set a header image.
Background Image: Allows to set a background image for WordPress website.
Menus: This section is used for creating new site menus, assigning its positions, and many more.
Widgets: Under this section, users can add different widgets in sidebar, footer, homepage, etc
Homepage Settings: Mostly, this section is used for assigning homepage as either a static page or blog page.
Theme Settings: This section is dependent on certain themes, allows more additional features offered by Theme authors.
Additional CSS: Custom or additional CSS can be assigned here. If you are expert to deal with CSS, HTML, and core designing skills, this section can be very helpful.

How To Use WordPress Theme Customizer?
After looking through various available features under theme customizer in WordPress, obviously there’s many thing you can customize within your website or blog. So let;s learn each above discussed options one by one.

1: Changing Default Website Fonts (Typography)
2: Site Title, Logo, and Favicon Customization (Site Identity)
3: Website Color Scheme Customization (Colors)
4: Header Image Customization (Header Image)
5: Customizing Background Image
6: Customizing Navigation Menus
7: Customizing WordPress Widgets
8: Customizing Homepage Settings
9: Customizing Theme Settings
10: Customizing Additional CSS

Need More Customizations In WordPress site?
The standard customizer settings is all here discussed in this article, but in case if you need more modifications which are not here specified, you can do so using WordPress Plugin. You can easily search and find more customization plugins which can add more tweaking options to your WordPress blog easily.

#customize wordpress theme #wordpress theme customizer #how to use wordpress theme customizer