question: joins objects with delim as the delimiter . concode_field_sep PlaceHolder placeHolder concode_field_sep String prependEach
target: StringBuilder function ( StringBuilder arg0 , String arg1 , Iterable < ? > arg2 ) { int loc0 = 0 ; for ( Object loc1 : arg2 ) { if ( loc0 ++ > 0 ) arg0 . append ( arg1 ) ; arg0 . append ( loc1 ) ; } return arg0 ; }