javascript check if element contains in arra code example

Example 1: see if array contains array javascript

const found = arr1.some(r=> arr2.indexOf(r) >= 0)

Example 2: how to check if an array contains a number in javascript

// To check if an array contains a number
const ratings = [1,2,3,4,5];

let result = ratings.includes(4); 
console.log(result); // true

result = ratings.includes(6); 
console.log(result); // false