CLEAR VARIABLE

Home

4D v16.3

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 String and Text variables, 0 for numeric variables, no elements for arrays, etc.). The variable still exists in memory.

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=On Load)

  ` Initialize the array one way or another

       ARRAY STRING(63;asMyDropDown;...)

  ` ...

    :(Form event=On Unload)

  ` No longer need the array

       CLEAR VARIABLE(asMyDropDown)

  ` ...

 End case