Logo

Programming-Idioms

This language bar is your friend. Select your favorite languages!
  • Java

Idiom #140 Delete map entry

Delete from map m the entry having key k.

Explain what happens if k is not an existing key in m.

map.remove(k);

Remove the entry for the key k from the map.
Returns null if the map does not have an entry for k
(dissoc m k)

Returns a new map without the key k. If k doesn't exist the original map is returned unaltered.
New implementation...
< > ⌨
programming-idioms.org 
map.remove(k);
(dissoc m k)
m.erase(k);

map.Remove(key);
m.remove(k);
Map myMap = {};
myMap.remove(key)
m = Map.delete(m, k)
delete(m, k)
delete k m
m.delete(k)
m[k]=nil
unset($m[k]);
m.delete(k);
delete $m{$k}; # also succeeds when $k does not exist in %m
m.pop(k, None)
m.delete(k)
m.remove(&k);
m - k
m -= k