Null

Null represents the absence of a value. It is a distinct runtime value, different from true, false, 0, or the empty string. In boolean contexts, null is falsy.

Literals

Declare null values:

make foo get null

A function with no return value implicitly returns null:

do do_nothing() start
    # no return statement
end

shout(typeof(do_nothing())) # prints "null"

Comparisons

null can be compared using the na (equal to) operator:

make foo get null
make baz get null

shout(foo na baz)  # prints true
shout(foo na 0)  # prints false
shout(foo na "") # prints false
shout(foo na false) # prints false

Boolean context

null behaves as falsy in conditional checks:

if to say(not null) start
    shout("null is falsy")
end