Determine whether a key exists within a Map.
MapExists ( map, key )
| map | An existing Map |
| key | The key to check |
| Success: | True |
| Failure: | False and sets the @error flag to non-zero |
#include <MsgBoxConstants.au3>
Example()
Func Example()
; Declare a map and assign with various keys value pairs.
Local $mMap[]
$mMap["Jasper"] = "Jasper value"
$mMap["Beethoven"] = "Beethoven value"
$mMap["Pinky"] = "Pinky value"
; Display whether the key exists or not.
MsgBox($MB_SYSTEMMODAL, "", "Jasper: " & MapExists($mMap, "Jasper")) ; Returns 1.
MsgBox($MB_SYSTEMMODAL, "", "Fidget: " & MapExists($mMap, "Fidget")) ; Returns 0.
; Clear a key by setting it to Null. The key will still exist in the map. Use MapRemove to remove the key entirely.
$mMap["Jasper"] = Null
MsgBox($MB_SYSTEMMODAL, "", "Jasper: " & MapExists($mMap, "Jasper")) ; Returns 1.
EndFunc ;==>Example