Declaring constant Map in Go

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Declaring constant Map in Go

Author：JIYIK Last Updated：2025/04/15 Views：

Map is a collection of key-value pairs which can be sorted in any order. It assigns values to keys.

The keys in a Map are always unique, but the values are not always unique. The map data structure is used for fast key-based data lookup, retrieval, and deletion.

It is a common data structure in computer science. In this article, we will look at declaring constant maps in Go.

Declaring constant maps in Go using map[int]string

This example will use map[int]stringto declare a constant map in Go.

example:

package main

import (
    "fmt"
)

var constMap = map[int]string{
    1: "Jay",
    2: "Adam",
    3: "Mike",
    4: "Wiz",
    5: "Lucas",
}

func main() {
    fmt.Println(constMap[1])
    fmt.Println(constMap[5])
}

Output:

Jay
Lucas

Declaring constant maps in Go using map[string]int

This example will use map[string]intto declare a constant map in Go.

example:

package main

import (
    "fmt"
)

var constMap = map[string]int{
    "Jay":   1,
    "Adam":  2,
    "Mike":  3,
    "Wiz":   4,
    "Lucas": 5,
}

func main() {
    fmt.Println(constMap["Jay"])
    fmt.Println(constMap["Lucas"])
}

Output:

1
5

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