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Mappings in Solidity are keyvalue store similar to object literal in Javascript {}.

They can represent collection of data, with each entry indexed by a key.

Compared to arrays, it' s easier to retrieve a single entry, however unlike arrays it's

Usually you will need a combination of both arrays and mappings to represent collection of data.

In this video I will show you how to declare and manipulate mappings in Solidity. We will cover simple mappings but also advanced mappings like nested mappings and array inside mappings.

WATCH Whole Solidity tutorial series:    • Solidity Tutorial: Introduction  

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