Web Reference: In practice, most ERC-20 token contracts use mapping (address => uint256) for balances — fast O (1) lookup at the cost of no native iteration. For the most up to date version of this content, please see Mapping (Code Example) on Cyfrin.io. Maps are created with the syntax mapping(keyType => valueType). The keyType can be any built-in value type, bytes, string, or any contract. valueType can be any type including another mapping or an array. Mappings are not iterable. 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.
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Solidity Mapping And Array Mobile Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
Estimated Worth: $38M - $70M
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Last Updated: April 12, 2026
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