Answers for "check if array has same values javascript"

javascript check if elements of one array are in another

const found = arr1.some(r=> arr2.includes(r))

check if array has same values javascript

const allEqual = arr => arr.every(v => v === arr[0]);
allEqual([1,1,1,1]);  // true

javascript check if array has duplicates

function hasDuplicates(array) {
    return (new Set(array)).size !== array.length;
}