Function Call
mergeArray ( a , b , n , m ) ; document . write ( " " ) ; for ( let i = 0 ; i < n ; i ++ ) document . write ( a [ i ] + " " ) ; document . write ( ' ' ) document . write ( " " ) ; for ( let i = 0 ; i < m ; i ++ ) document . write ( b [ i ] + " " ) ;