Finding the closest number in a random set

Question

Say I got a set of 10 random numbers between 0 and 100.

An operator gives me also a random number between 0 and 100. Then I got to find the number in the set that is

Answer 1

• given an array called input, create another array of the same size
• each element of this new array is the Math.abs(input[i] - operatorNumber)
• select the index of the mininum element (let's call it k)
• your answer is input[k]

NB

• sorting is not needed
• you can do it without the extra array

Sample implementation in JavaScript

function closestTo(number, set) {
    var closest = set[0];
    var prev = Math.abs(set[0] - number);

    for (var i = 1; i < set.length; i++) {
        var diff = Math.abs(set[i] - number);

        if (diff < prev) {
            prev = diff;
            closest = set[i];
        }
    }

    return closest;
}