question: private V removeFromDataIndexOfKey ( int dataIndexOfKey ) { int dataSize = this . size << 1 ; if ( dataIndexOfKey < 0 || dataIndexOfKey >= dataSize ) { return null ; } V result = valueAtDataIndex ( dataIndexOfKey + 1 ) ; Object [ ] data = this . data ; int moved = dataSize - dataIndexOfKey - 2 ; if ( moved != 0 ) { System . arraycopy ( data , dataIndexOfKey + 2 , data , dataIndexOfKey , moved ) ; } this . size -- ; setData ( dataSize - 2 , null , null ) ; return result ; }
target:  Removes the key/value mapping at the given data index of key, or ignored if the index is out of bounds.