Power set: Difference between revisions

Content added Content deleted

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@@ Line 1,043: / Line 1,043: @@
 {{works with|SpiderMonkey}}
 <lang javascript>function powerset(ary) {
-    var ps = new Array(new Array());
+    var ps = [[]];
     for (var i=0; i < ary.length; i++) {
-        // we modify the ps array in the next loop,
+        for (var j = 0, len = ps.length; j < len; j++) {
-        // so can't use the ps.length property directly in the loop condition.
-        var current_length = ps.length;
-        for (var j = 0; j < current_length; j++) {
             ps.push(ps[j].concat(ary[i]));
         }