I have:

mapping (uint256 => uint64[]) public Arry;

I am trying to do:


And I am getting the generic invalid opcode.

To me, I am accessing map key 123 which is a uint64 array. I am then incrementing the uint64 in position 0 by one. I don't understand why it dies here.


Arry[123][0] is out of bounds if Arry[123] has a length of 0. Make sure the array has at least one element in it.

Your code works fine for me as long as I do Arry[123].push(0) somewhere first.

  • You're right. It worked after I deleted my build folder and ran truffle test. – ArnonRednon Jan 14 '18 at 2:44

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