According to the relationship between data, combined data types can be divided into three categories: sequence type, set type and mapping type. Combined data types can better organize multiple similar or different types, making the data more orderly and easier through a single representation.
The sequence type is a vector of elements. There is a sequential relationship between the elements. They are accessed through serial numbers, and the elements are not exclusive.
The set type is an element type, the elements are unordered, and the same elements only exist in the set.
The mapping type is a combination of "key-value" data items. Each element is a key-value pair, expressed as (key, value).
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