Maps

A map stores a collection of key/value pairs.
In other languages a map is called a hash table or dictionary.
The key type in a map (map[keyType]valueType) must be a comparable type.

// Create a map
var m = make(map[string]string)

// Insert or update
m["key"] = "value"

// Get element or zero value
var value = m["key"]

// Contains key
v, ok := m["key"]

// Delete key-value pair
delete(m, "key")

// Remove all key-value pairs
clear(m)

// Map Literal
var table = map[int]string{
    1: "A",
    2: "B",
    3: "C",
}

Nil map

Writing to a nil map will panic.
Initialize a map with the built in make function.