Проверьте, имеет ли массив те же значения JavaScript
const allEqual = arr => arr.every(v => v === arr[0]);
allEqual([1,1,1,1]); // true
TC5550
const allEqual = arr => arr.every(v => v === arr[0]);
allEqual([1,1,1,1]); // true// how to check all values of an array are equal or not in javascript
const allEqual = (arr) => arr.every(val => val === arr[0]);
console.log(allEqual([1, 2, 3, 4, 5, 6])); // false
console.log(allEqual([1, 1, 1, 1])); // true[1,1,1,1].every( (val, i, arr) => val === arr[0] ) // true