Check if all elements in an array are equal using JavaScript
const allEqual = arr => arr.every(val => val === arr[0]); allEqual ([1, 2, 3, 4, 5, 6]); // false allEqual ([1, 1, 1, 1]); // true
const allEqual = arr => arr.every(val => val === arr[0]); allEqual ([1, 2, 3, 4, 5, 6]); // false allEqual ([1, 1, 1, 1]); // true