Gets the number in the middle

middle.js

function middle() {

     var numbers = Array.prototype.slice.call(arguments);

     if (numbers.length % 2 == 0) throw Error("The number of parameters should be odd");
      
     var min, max;
    
     while (numbers.length > 1) {

        min = Math.min.apply(null, numbers);
        max = Math.max.apply(null, numbers);
        numbers.splice(numbers.indexOf(min), 1);
        numbers.splice(numbers.indexOf(max), 1);
    }


    return numbers[0];
          
}