iterate loop over mapping in solidity
// Answer 1 // initialise a counter and an mapping in addition to the mapping you intend to iterate over uint counter; // you should initialize this to 0 in the constructor // the value in the countToAddress mapping points to the key in the next mapping mapping (uint => address) private countToAddress; // intend to iterate over the addressToValue mapping: mapping (address => uint) private addressToValue; function iterateOverAddressToValue() public { uint currentValue; for (uint i=0; i < counter; i++) { currentValue = addressToValue[countToAddress[i]]; } }
Source: stackoverflow.com