A two dimensional array exercise from Cyrus Adkisson's Solidity walkthrough
Historical Significance
The 2D array chapter of cyrusadkisson/solidity-baby-steps, reading a value out of a nested fixed array by column and row. This is the same getValue shape that later became getElevation in the Etheria map storage contracts. Deployed 12 September 2015 and later destroyed.
Context
Frontier era deployment by Cyrus Adkisson, from his Solidity teaching repository.
Key Facts
Description
The 2D array chapter of cyrusadkisson/solidity-baby-steps, reading a value out of a nested fixed array by column and row. This is the same getValue shape that later became getElevation in the Etheria map storage contracts. Deployed 12 September 2015 and later destroyed.
Source Verified
Exact creation bytecode match. Author Cyrus Adkisson published source at https://github.com/cyrusadkisson/solidity-baby-steps/blob/master/contracts/55_2D_array.sol. Batch-matched against 357 deploy TXs from deployer 0xcf684dfb8304729355b58315e8019b1aa2ad1bac.
Historian Categories
Heuristic Analysis
The following characteristics were detected through bytecode analysis and may not be accurate.
Frontier Era
The initial release of Ethereum. A bare-bones implementation for technical users.
Bytecode Overview
Verified Source Available
Source verified through compiler archaeology and exact bytecode matching.
View Verification ProofShow source code (Solidity)
contract TwoD {
address creator;
uint8 arraylength = 10;
uint8[10][10] integers; // compiler says this line can't yet know about arraylength variable in the line above
function TwoD()
{
creator = msg.sender;
uint8 x = 0;
uint8 y = 0;
while(y < arraylength)
{
x = 0;
while(x < arraylength)
{
integers[x][y] = arraylength*y + x; // row 0: 0, 1 row 1: 2, 3
x++;
}
y++;
}
}
function getValue(uint8 x, uint8 y) constant returns (uint8)
{
return integers[x][y];
}
/**********
Standard kill() function to recover funds
**********/
function kill()
{
if (msg.sender == creator)
{
suicide(creator); // kills this contract and sends remaining funds back to creator
}
}
}External Links
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