How Do I Delete a Key from a Go Map?

Removing a Key from a Go Map

Maps are data structures that associate keys with values. Deleting a key from a map is often necessary to manage data and maintain its integrity.

One method to delete a key from a map in Go is using the delete function. The delete function takes two arguments: a map and a key, and removes the specified key from the map. For example:

package main

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

This code will delete the key "moo" from the sessions map.

Historical Syntax

Prior to Go version 1, deleting a key from a map involved setting the value associated with the key to nil. This syntax is no longer supported in Go 1 and onwards.

Example Usage

The following code snippet illustrates how to use the delete function:

var sessions = make(map[string][]string)
sessions["user1"] = []string{"John", "Doe"}
sessions["user2"] = []string{"Jane", "Doe"}

delete(sessions, "user1")

After executing this code, the user1 key will be removed from the sessions map, leaving only the user2 key.

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