Javascript: Find the closest number in an array

JavaScript

var arr = [162, 362, 202, 242, 2, 42, 282, 322, 82, 122, 56, 67, 1, 13, 250];

function get_closest(number, array) {
        var current = array[0];
        var difference = Math.abs(number - current);
        var index = array.length;
        while (index--) {
            var newDifference = Math.abs(number - array[index]);
            if (newDifference < difference) {
                difference = newDifference;
                current = array[index];
            }
        }
        return current;
    };

function closest(num, arr) {
                var curr = arr[0];
                var diff = Math.abs (num - curr);
                for (var val = 0; val < arr.length; val++) {
                    var newdiff = Math.abs (num - arr[val]);
                    if (newdiff < diff) {
                        diff = newdiff;
                        curr = arr[val];
                    }
                }
                return curr;
            }

console.log(arr);
var target = 112;
console.time("one");
console.log(get_closest(target, arr));
console.timeEnd("one");
console.time("two");
console.log(closest(target, arr));
console.timeEnd("two");