Null-check in javascript

In this article,we are going to make a program which efficently checks null values, undefined, empty array, empty string, false value and NaN. These values will give a tough time if you have not checked it effeciently in programming.

We are you using reactjs for DOM manipulation but you don't worry, our main focus is on handle null check in javascript. For learing reactjs visit here.

App.js file is displayed below:

This is our reactjs file in which only DOM manipulation is done.

1import "./styles.css";
2import React from 'react'
3import Null, from './null'
4 export default class App extends React.Component {
5  constructor(props)
6  {
7    super(props)
8    this.state={
9      Data:"",
10      output:""
11    }
12  };
13  getNull=()=>{
14    if(Null(this.state.Data))
15    {
16      this.setState({
17        output:"Null executed"
18      })
19    }else{
20     this.setState({
21       output:"Null not executed"
22     })
23    }
24  }
25  render() {
26    return <><button onClick={()=>this.getNull()}>Click here</button><h1>{this.state.output}</h1></>;
27  }
28}

Null.js file is displayed below

This is our main file where we are checking null values in javascript.

1const Null = (value) => {
2  if (
3    value === '' ||
4    value === 0||
5    value === 'Null' ||
6    value === false||
7    value === NaN ||
8    value === null ||
9    value === undefined || 
10    value.length === 0 ||
11    value === -1 ||
12    value === "" 
13  ) {
14    return true
15  } else {
16    return false
17  }
18}
19
20export default Null

Here is the link of live example which we done so far:
Click here