值小于length的数组 - json中的null-overhead

I'm writing a simple game. It's based on a field that is 32x32 squares. Each square can contain a game element. When an element appears/moves/changes, the server sends a json object containing a 2d array that resembles the whole game field with all it's elements via websockets to all clients. I'm writing a simple game. It's based on a fiel