On Wednesday, 21 March 2018 at 15:53:32 UTC, tipdbmp wrote: > int[10][string] foo; One option is to initialize like this --- void main() { int[10][string] foo; if("a" !in foo) foo["a"] = [0,0,0,0,0,0,0,0,0,0]; // set all to zero to create the key foo["a"][4] = 4; // now valid to set individual element } ---