How can I use slices as keys in a Go map?

Using Slices as Map Keys

While the compiler prohibits the usage of slices as direct map keys due to their mutable nature, an alternative approach can be employed: converting slices to arrays before using them as keys.

Example:

package main

import "fmt"

func main() {
    h := make(map[[2]string]string)
    h[[2]string{"a", "b"}] = "ab"

    fmt.Printf("%v", h)
}

In this example, a map where the keys are arrays of strings is created. The type of the map key is explicitly defined as [2]string, which is an array of strings with a fixed size of 2.

Explanation:

Since arrays are immutable in Go, they adhere to the requirements of being a valid map key. This allows you to effectively use slices as keys by converting them to fixed-size arrays. Arrays offer the necessary immutability and uniqueness, ensuring reliable and consistent map operations.

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