The nil value defined in the Metview Macro language can be used in the ways described below - an example of the use of nil for initialisation of lists can be found in Lists.
any (nil & any)
any (any & nil)
The value nil can be concatenated to any other value. The result is the original value.
number (nil = any)
number (any = nil)
number (nil <> any)
number (any <> nil)
Any value can be compared with nil . Only nil is equal to nil . Returns a number, either 0 (false) or 1 (true).
number count (nil)
Returns 0.