How do I Delete Keys from a Go Map?

Deletion in Go Maps

In Go, maps are a versatile data structure used to store key-value pairs. Deleting keys from a map can be crucial for memory management or altering the stored data. This question addresses how to remove a key from a map in Go.

Pre-Go v1 Deletion

Before version 1 of Go, there was no dedicated syntax for deleting map entries. Users had to resort to assigning nil to the corresponding map value:

sessions[key] = nil, false

However, this approach was ineffective as it only nullified the value associated with the key, leaving the key itself in the map.

Go v1: Introduction of delete function

In Go version 1, the delete function was introduced as the preferred way to remove keys from maps:

package main

func main() {
    var sessions = map[string]chan int{}
    delete(sessions, "moo")
}

The delete function takes two arguments: the map to modify and the key to delete. It effectively removes the specified key and its associated value from the map.

Usage of delete function

To remove a key called "moo" from the sessions map:

delete(sessions, "moo")

After calling delete, the sessions map will no longer contain the "moo" key or its corresponding value.

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