CLEAR VARIABLE
CLEAR VARIABLE ( variable )
| Parameter | Type | Description | |
|---|---|---|---|
| variable | Variable | → | Variable to clear |
Description
CLEAR VARIABLE resets variable to its default type value (i.e., empty string for Text variables, 0 for numeric variables, no elements for arrays, etc.). The variable still exists in memory.
Note: For more information on default type values, please refer to the Default values paragraph.
The variable you pass in variable can be a local, process or interprocess variable.
Note: You do not need to clear process variables when a process ends; 4D clears them automatically. Similarly, each local variable is automatically cleared when the method in which it was created completes execution.
Example
In a form, you are using the drop-down list asMyDropDown whose sole purpose is user interface. In other words, you use that array during data entry, but once you are done with the form, you will no longer use that array. Consequently, during the On Unload event, you just get rid of the array:
//asMyDropDown drop-drop list object method
Case of
:(Form event code=On Load)
//Initialize the array one way or another
ARRAY TEXT(asMyDropDown;...)
// ...
:(Form event code=On Unload)
//No longer need the array
CLEAR VARIABLE(asMyDropDown)
// ...
End case