if list contains javascript code example

Example 1: javascript element in array

var fruits = ["Banana", "Orange", "Apple", "Mango"];

var n = fruits.includes("Mango");

Example 2: check if array does not contain string js

function checkInput(input, words) {
 return words.some(word => new RegExp(word, "i").test(input));
}

console.log(checkInput('"Definitely," he said in a matter-of-fact tone.', 
["matter", "definitely"]));