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 leastCommonMultiple(arr) {
    /*
      function range(min, max) {
        var arr = [];
       for (var i = min; i <= max; i++) {
        arr.push(i);
      }
       return arr;
    }
    */
    var min, range;
     range = arr;
    if(arr[0] > arr[1]){
       min = arr[1];
    }
    else{
       min = arr[0]
    }

    function gcd(a, b) {
        return !b ? a : gcd(b, a % b);
    }

    function lcm(a, b) {
        return (a * b) / gcd(a, b);   
    }

   var multiple = min;
    range.forEach(function(n) {
       multiple = lcm(multiple, n);
    });

   return multiple;
}

console.log( leastCommonMultiple([1, 13]) )