How to Check If an Element Exists in ReactJS

Today, We want to share with you How to Check If an Element Exists in ReactJS.In this post we will show you check if value already exists in array ReactJS, hear for React.JS check if value exists in array of objects we will give you demo and example for implement.In this post, we will learn about check if an array contains all elements in another array in ReactJS with an example.

How to Check If an Element Exists in ReactJS

There are the Following The simple About How to Check If an Element Exists in ReactJS Full Information With Example and source code.

As I will cover this Post with live Working example to develop React.JS check if array contains value, so the check if value exists in array react for this example is following below.

Check if item exists in array React

handleCheck(val) {
    return this.state.data.some(item => val.name === item.name);
}

Way 2:

var arr = ["kupendra", "jaydeep", "mayur"];

console.log(arr.indexOf("jaydeep") > -1); //true

Check if property exists using React.js

{this.props.propInQuestion ? <a href="#">link</a> : null}

Other Way

if ('parent_node' in current_node)

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