rem: return this.select(function(value) { return value != undefined || value != null; 
add: return this.map(function(value, index) { return iterator(collections.pluck(index)); 
context:     return this.select(function(value) {      return value != undefined || value != null;    });
meta: 4707	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/4707/50c3492c4c3c825dbd3401e134a19ed46799c456/prototype.js/clean/www/resources/prototype/prototype.js