Web Reference: Nov 23, 2021 · Learn what the mapping and array types are in Solidity, how they work, and when to use one over the other in a Solidity smart contract. Mapping vs. Array in Solidity explained. The data structure that you should use for storing all these proposals, rather than being an array, it will be a mapping. A mapping is a reference type that is available to us inside of Solidity. Mappings cannot be iterated over or returned from functions — they have no notion of "all keys." If you need to track which keys exist, maintain a separate array alongside the mapping. solidity
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