- if ( obj.length == undefined )
- for ( var i in obj )
- fn.apply( obj[i], args || [i, obj[i]] );
- else
- for ( var i = 0, ol = obj.length; i < ol; i++ )
- if ( fn.apply( obj[i], args || [i, obj[i]] ) === false ) break;
+ if ( args ) {
+ if ( obj.length == undefined )
+ for ( var i in obj )
+ fn.apply( obj[i], args );
+ else
+ for ( var i = 0, ol = obj.length; i < ol; i++ )
+ if ( fn.apply( obj[i], args ) === false ) break;
+
+ // A special, fast, case for the most common use of each
+ } else {
+ if ( obj.length == undefined )
+ for ( var i in obj )
+ fn.call( obj[i], i, obj[i] );
+ else
+ for ( var i = 0, ol = obj.length, val = obj[0];
+ i < ol && fn.call(val,i,val) !== false; val = obj[++i] ){}
+ }
+