Delete from a map

The delete built-in function removes the element with the specified key from a map.

people := map[string]int{"john": 30, "jane": 29}
fmt.Printf("%v\n", people)

delete(people, "john")
fmt.Printf("%v\n", people)

try online

map[jane:29 john:30]
map[jane:29]

If the map is nil or there is no such element, delete has no effect.

people := map[string]int{"john": 30, "jane": 29}
fmt.Printf("%v\n", people)

// deleting a key that doesn't exist is a no-op
delete(people, "notfound")
fmt.Printf("%v\n", people)

// deleting a key in nil map is a no-op
var something map[string]int
delete(something, "notfound")

try online

map[jane:29 john:30]
map[jane:29 john:30]

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