The LEN()
function counts the number of characters in a string.
DECLARE FUNCTION LEN AS BYTE (arg$ AS STRING) SHARED STATIC INLINE
If the argument is a variable, the function will return the actual length of the string, rather than the length to which the variable was defined.
PRINT LEN("") : REM outputs 0 PRINT LEN("hello") : REM outputs 5 DIM a$ AS STRING * 16 a$ = "world" PRINT LEN(a$) : REM outputs 5 (the actual length of the string)