return slices.collect(iterator || Prototype.K); 
return slices.map(iterator); 
  eachSlice: function(number, iterator) {    var index = -number, slices = [], array = this.toArray();    while ((index += number) < array.length)      slices.push(array.slice(index, index+number));    return slices.collect(iterator || Prototype.K);  },
742	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/742/53dfa93e53bccf5af1729cbdce88cb70e1ffcca5/prototype.js/clean/public/javascripts/prototype.js