#843 bug
Yaffle

Array#concat bug

Reported by Yaffle | October 25th, 2009 @ 05:10 PM

concat function, used to replace native concat, not following ES5

  var x = new Array(3);
  x = x.concat(x);
  alert(4 in x);
  // -> true - Opera
  // -> false - FF, IE, Chrome, Safari
  alert( Array.prototype.concat.call('a', 'b').join(', ') );
  // ", b" - Opera
  // "a, b" - FF, IE, Chrome, Safari

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The Prototype JavaScript library.

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