How to find the least common multiple of a range of numbers?

Question

Given an array of two numbers, let them define the start and end of a range of numbers. For example, [2,6] means the range 2,3,4,5,6. I want to write javascrip

Answer 1

function lcm(arr) {
  var max = Math.max(arr[0],arr[1]),
      min = Math.min(arr[0],arr[1]),
      lcm = max;
  var calcLcm = function(a,b){
    var mult=1;
    for(var j=1; j<=a; j++){
      mult=b*j;
      if(mult%a === 0){
        return mult;
      }
    }
  };
  for(var i=max-1;i>=min;i--){
    lcm=calcLcm(i,lcm);
  }
  return lcm;
}
lcm([1,13]); //should return 360360.