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# update(+Map0, ++Key, ?Value, -Map)

Update the value corresponding to a key in a map.

Map0
  A map
Key
  A key to update
Value
  The value corresponding to Key
Map
  The map after updating

## Description

If the key Key already exists in the map Map0, then this predicate updates the corresponding value to be Value. The resulting map is Map.

This predicate should only be called with maps created by other predicates from the map module.

### Fail Conditions

Fails if Key does not appear in Map0.

### Resatisfiable

no

## See Also

det_update / 4, insert / 4, det_insert / 4, set / 4