util.JSONArray.getLength
Returns the number of elements in the JSON array object.
Syntax
util.JSONArray.getLength()
  RETURNS INTEGERUsage
The getLength() method returns the number of elements in the
JSON array object.
This method can be used along with the get() and
 getType() method to read elements of a JSON array object.
Example
IMPORT util
MAIN
    DEFINE arr util.JSONArray
    DEFINE i INTEGER
    LET arr = util.JSONArray.parse('[123,8723,9232]')
    FOR i=1 TO arr.getLength()
        DISPLAY i, ": ", arr.get(i)
    END FOR
END MAINOutput:
          1:                   123.0
          2:                  8723.0
          3:                  9232.0