Coding interview preparation

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🧿  ReactJS Cheat-Sheet

This Post includes a ReactJs cheat sheet to make it easy for our followers to work with Reactjs.

Common Coding Mistakes to Avoid Even experienced programmers make mistakes.

Undefined variables:

Ensure all variables are declared and initialized before use.

Type coercion:

Be mindful of JavaScript's automatic type conversion, which can lead to unexpected results.

Incorrect scope:

Understand the difference between global and local scope to avoid unintended variable access.

Logical errors:

Carefully review your code for logical inconsistencies that might lead to incorrect output.

Off-by-one errors:

Pay attention to array indices and loop conditions to prevent errors in indexing and iteration.

Infinite loops:

Avoid creating loops that never terminate due to incorrect conditions or missing exit points. Example: // Undefined variable error let result = x + 5; // Assuming x is not declared // Type coercion error let age = "30"; let isAdult = age >= 18; // Age will be converted to a number By being aware of these common pitfalls, you can write more robust and error-free code. Do you have any specific coding mistakes you've encountered recently?

4. props

// ES5 var App = React.createClass({ propTypes: { name: React.PropTypes.string }, render: function() { return( <h3>Hello, {this.props.name}!</h3> ); } }); // ES6 class App extends React.Component { render() { return( <h3>Hello, {this.props.name}!</h3> ); } }

3. component and function

// ES5 var MyComponent = React.createClass({ render: function() { return( <h3>Hello JavaTpoint</h3> ); } }); // ES6 class MyComponent extends React.Component { render() { return( <h3>Hello Javatpoint</h3> ); } }

2. exports vs. export

// ES5 module.exports = Component; // ES6 export default Component;

How React's ES6 syntax is different from ES5 syntax? 1. require vs. Import

// ES5 var React = require('react'); // ES6 import React from 'react';