これはRubyとJavaScriptで同じ処理を書いたものです


# Ruby
[1,2,3,4].each do |i|
p i
end


↓↓↓↓

# JavaScrit
/* Generated by Opal 0.8.0.beta1 */
(function(Opal) {
Opal.dynamic_require_severity = "error";
var $a, $b, TMP_1, self = Opal.top, $scope = Opal, nil = Opal.nil, $breaker = Opal.breaker, $slice = Opal.slice;

Opal.add_stubs(['$each', '$p']);
return ($a = ($b = [1, 2, 3, 4]).$each, $a.$$p = (TMP_1 = function(i){var self = TMP_1.$$s || this;
if (i == null) i = nil;
return self.$p(i)}, TMP_1.$$s = self, TMP_1), $a).call($b)
})(Opal);