// from http://eloquentjavascript.net/chapter6.html

var forEach = function(array, action) {
  for (var i = 0; i < array.length; i++){
      action(array[i]);
  }
};

var range = function(a, b) {
    var arr = [];
    for(var i = 0; i < b - a; i++) {
        arr[i] = i + a;
    }
    return arr;
};

var sum = function(arr) {
    var total = 0;
    forEach(arr, function(a) {
        total += a;
    });
    return total;
};

println(sum(range(0, 101)));