Check if item exists in array React

Use the includes() method on the array instance.

console.log(['red', 'green'].includes('red'))
console.log(['red', 'green'].includes('blue'))

While searching for Check value exists in an array in React, I was landed in this page and would like to give a solution (apart from this question) for others who think there is any special case to check for a value in an array using React.

You can rightly use the default JavaScript method too. There is nothing special when it comes to React.

var arr = ["steve", "bob", "john"];

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

Thank you.

it should be:

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

because val here is an Object not a String.

Check this out: https://www.webpackbin.com/bins/-Kpo0Rk6Z8ysenWttr7q