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Compression of CoffeeScript output · Issue #315 · mishoo/UglifyJS · GitHub
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Description
I'm wondering if UglifyJS2 might not be able to do a better job at compressing common output of CoffeeScript. Here an example:
test = (
(s) -> w.toLowerCase() for w in s.trim().split(" ")
)("test")
Which compiles to this:
var test;
test = (function(s) {
var w, _i, _len, _ref, _results;
_ref = s.trim().split(" ");
_results = [];
for (_i = 0, _len = _ref.length; _i < _len; _i++) {
w = _ref[_i];
_results.push(w.toLowerCase());
}
return _results;
})("test");
Which is uglified to this:
var test;
test = function(t) {
var e, r, s, n, o;
for (n = t.trim().split(" "), o = [], r = 0, s = n.length; s > r; r++) e = n[r],
o.push(e.toLowerCase());
return o;
}("test");
Shouldn't it also be possible to produce the following?
var test = function(t) {
var n = t.trim().split(" "), o = [], r = 0, s = n.length;
for (; s > r; r++) o.push(n[r].toLowerCase());
return o;
}("test");
I removed the unnecessary temporary variable e
from the last example, but mostly I'm referring to moving assignments up into the corresponding var
declaration. I'm new to UglifyJS, so forgive me if I'm just missing a compiler flag.
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