Find the number in an array that is closest to a given number

Question

I have an Array of integers in javascript, [5,10,15,20,25,30,35] when given a number x, how can I find the element in the array that is closest to that number?

Answer 1

I created my own function since i could not find any that meets my requeriments.

    function closest_number(quantities, number, closest_factor)
    {
        if (closest_factor == 'ceil')
        {
            quantities.sort(function(a, b)
                {
                    return a - b
                }
            );

            for (var i = 0; i < quantities.length; i++)
            {
                if (quantities[i] >= number)
                {
                    return quantities[i];
                }

                last_value = quantities[i];
            }

            return last_value;
        }
        else if (closest_factor == 'floor')
        {
            quantities.sort(function(a, b)
                {
                    return a - b
                }
            );

            min_value = quantities[0];

            for (var i = 0; i < quantities.length; i++)
            {
                if (number == quantities[i])
                {
                    return number;
                }
                else if (quantities[i] < number)
                {
                    min_value = quantities[i];
                }
                else if(quantities[i] > number)
                {
                    return min_value;
                }           
            }

            return min_value;
        }
        else
        {
            return false;
        }
    };