How to determine whether map exists in golang

Map is an unordered collection of key-value pairs. The most important point of Map is to quickly retrieve data through key, which is similar to an index and points to the value of the data.

Map is a collection, so we can iterate over it just like arrays and slices. However, Map is unordered and we cannot determine the order in which it is returned. This is because Map is implemented using a hash table.

Golang determines whether the map exists:

   if v, ok := m1["a"]; ok {
        fmt.Println(v)
    } else {
        fmt.Println("Key Not Found")
    }

If ok is true, it means the map exists, and if ok is false, the map does not exist.

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