Delete key in map
DictionaryGoDictionary Problem Overview
I have a map:
var sessions = map[string] chan int{}
How do I delete sessions[key]
? I tried:
sessions[key] = nil,false;
That didn't work.
Update (November 2011):
The special syntax for deleting map entries is removed in Go version 1:
> Go 1 will remove the special map assignment and introduce a new built-in function, delete
: delete(m, x)
will delete the map entry retrieved by the expression m[x]
. ...
Dictionary Solutions
Solution 1 - Dictionary
Go introduced a delete(map, key)
function:
package main
func main () {
var sessions = map[string] chan int{};
delete(sessions, "moo");
}
Solution 2 - Dictionary
release notes
Copied from Go 1In the old language, to delete the entry with key k
from the map represented by m
, one wrote the statement,
m[k] = value, false
This syntax was a peculiar special case, the only two-to-one assignment. It required passing a value (usually ignored) that is evaluated but discarded, plus a boolean that was nearly always the constant false. It did the job but was odd and a point of contention.
In Go 1, that syntax has gone; instead there is a new built-in function, delete
. The call
delete(m, k)
will delete the map entry retrieved by the expression m[k]
. There is no return value. Deleting a non-existent entry is a no-op.
Updating: Running go fix
will convert expressions of the form m[k] = value, false
into delete(m, k)
when it is clear that the ignored value can be safely discarded from the program and false
refers to the predefined boolean constant. The fix tool will flag other uses of the syntax for inspection by the programmer.
Solution 3 - Dictionary
From Effective Go:
> To delete a map entry, use the delete built-in function, whose arguments are the map and the key to be deleted. It's safe to do this even if the key is already absent from the map. > > delete(timeZone, "PDT") // Now on Standard Time
Solution 4 - Dictionary
delete(sessions, "anykey")
These days, nothing will crash.
Solution 5 - Dictionary
Use make (chan int)
instead of nil
. The first value has to be the same type that your map holds.
package main
import "fmt"
func main() {
var sessions = map[string] chan int{}
sessions["somekey"] = make(chan int)
fmt.Printf ("%d\n", len(sessions)) // 1
// Remove somekey's value from sessions
delete(sessions, "somekey")
fmt.Printf ("%d\n", len(sessions)) // 0
}
UPDATE: Corrected my answer.