DYNAMIC ARRAY.clear
Removes all elements of the array.
Syntax
clear( )
Usage
This method clears the array, by removing all its elements.
For example, if the array is not empty, use the clear() method just before
filling the array with a new set of elements.
Example
MAIN
    DEFINE a1 DYNAMIC ARRAY OF STRING
    CALL fill_array(a1)
    DISPLAY a1.getLength()
    DISPLAY a1[3]
END MAIN
FUNCTION fill_array(arr)
    DEFINE arr DYNAMIC ARRAY OF STRING
    DEFINE i INTEGER
    CALL arr.clear()
    FOR i=1 TO 10
       LET arr[i] = "Item #"||i
    END FOR
END FUNCTION