Check if an array is descending, ascending or not sorted?

Question

I\'m just beginning with programming using javascript and I need to practice some questions to get EXP with the logic of code build. I got this question for homework but I c

Answer 1

You could use a copy from the second element and check the predecessor for the wanted sort order.

function checkArray(array) {
    var aa = array.slice(1);
    if (!aa.length) {
        return "Just one element";
    }
    if (aa.every((a, i) => array[i] > a)) {
        return "Ascending";
    }
    if (aa.every((a, i) => array[i] < a)) {
        return "Descending";
    }
    return "Unsorted";
}

console.log(checkArray([1, 2, 3, 4, 5]));
console.log(checkArray([5, 4, 3, 2, 1]));
console.log(checkArray([3, 1, 4, 2, 5]));
console.log(checkArray([42]));