rem: return this.map(function(value, index) { iterator(value = collections.pluck(index)); return value; 
add: this.each(function(value, index) { ((iterator || Prototype.K)(value, index) ? trues : falses).push(value); 
context:     return this.map(function(value, index) {      iterator(value = collections.pluck(index));      return value;    });
meta: 2801	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/2801/7e143d2df37946a5416f0f043869478087652eb6/prototype.js/clean/examples/testcases/prototype.js