question: private void append ( StringBuilder buffer , double [ ] data , String prefix , String separator , String suffix ) { buffer . append ( prefix ) ; for ( int i = 0 ; i < data . length ; ++ i ) { if ( i > 0 ) { buffer . append ( separator ) ; } buffer . append ( data [ i ] ) ; } buffer . append ( suffix ) ; }
target:  Append a text representation of an array to a buffer.