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"Cleaned up"? _.range (or maybe not)

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Ryan W Tenney
2010-10-05 22:36:15 -04:00
parent 81ce3ee0bd
commit 1c6e01173a
1 changed files with 12 additions and 9 deletions
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21
underscore.js
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@@ -353,16 +353,19 @@
// the native Python `range()` function. See
// [the Python documentation](http://docs.python.org/library/functions.html#range).
_.range = function(start, stop, step) {
var a = slice.call(arguments);
var solo = a.length <= 1;
var start = solo ? 0 : a[0], stop = solo ? a[0] : a[1], step = a[2] || 1;
var len = Math.ceil((stop - start) / step);
if (len <= 0) return [];
var range = new Array(len);
for (var i = start, idx = 0; true; i += step) {
if ((step > 0 ? i - stop : stop - i) >= 0) return range;
range[idx++] = i;
var args = slice.call(arguments),
solo = args.length <= 1,
start = solo ? 0 : args[0],
stop = solo ? args[0] : args[1],
step = args[2] || 1,
len = Math.max(Math.ceil((stop - start) / step), 0),
idx = 0,
range = new Array(len);
while (idx < len) {
range[idx++] = start;
start += step;
}
return range;
};
// Function Functions