check if array has same values javascript code example
Example 1: javascript check if elements of one array are in another
const found = arr1.some(r=> arr2.includes(r))
Example 2: check if array has same values javascript
const allEqual = arr => arr.every(v => v === arr[0]);
allEqual([1,1,1,1]); // true
Example 3: javascript check if array has duplicates
function hasDuplicates(array) {
return (new Set(array)).size !== array.length;
}