Working with arrays in coffeescript

coffeescript-arrays.coffee

# 
# Working with arrays, ranges and numbers in coffeescript:
# I've been working with a lot of arrays to do lazy loading
# heres how awesome the array syntax is:

# you can use ranges to loop over functions. 

# heres a list of the numbers 100 through 115
big_list = (num for num in [100..115])

# i want to count to 100 to 110
console.log "count from 100 to 110."

# count to 4
big_list[1..4].map (i)->
  console.log i + '.'

# each loop over an array
big_list[5..6].forEach (i) ->
  console.log i + '.'

# count to 7 to 10
# 3 dots means drop the end
console.log i + '.' for i in big_list[7...11]

# 
console.log 'count the rest anyways'
console.log i + '.' for i in big_list[11..big_list.length]

# count from 100 to 115.
# 101.
# 102.
# 103.
# 104.
# 105.
# 106.
# 107.
# 108.
# 109.
# 110.
# count the rest anyways
# 111.
# 112.
# 113.
# 114.
# 115. 


#produces the following javascript
#
# var big_list, i, num, _i, _j, _len, _len2, _ref, _ref2;
# big_list = (function() {
#   var _results;
#   _results = [];
#   for (num = 100; num <= 115; num++) {
#     _results.push(num);
#   }
#   return _results;
# })();
# console.log("count from 100 to 115.");
# big_list.slice(1, 5).map(function(i) {
#   return console.log(i + '.');
# });
# big_list.slice(5, 7).forEach(function(i) {
#   return console.log(i + '.');
# });
# _ref = big_list.slice(7, 11);
# for (_i = 0, _len = _ref.length; _i < _len; _i++) {
#   i = _ref[_i];
#   console.log(i + '.');
# }
# console.log('count the rest anyways');
# _ref2 = big_list.slice(10, (big_list.length + 1) || 9e9);
# for (_j = 0, _len2 = _ref2.length; _j < _len2; _j++) {
#   i = _ref2[_j];
#   console.log(i + '.');
# }
#