Go language Learning-complex types (2)

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Map

A map is a collection of key and value pairs.

You can create a map using only the built-in function make

Cases:

Book: = Make (Map[string]int)

You can also create a value by using literal values.

Cases:

Book: = map[string]int{"Red": 1, "green": 36}

Use the built-in function Delete to remove key values

Map can also use range to iterate, using the Key/value structure when iterating over a map

To check if an element exists, you can use the following method:

V, OK: = map["Red"]

The result is v==1 ok==ture