Shortcut OR. Evaluates and returns the first value that is not FALSE or NONE.
any block
block - Block of expressions (must be: block)
Evaluates each expression in a block until one of the expressions returns a value other than NONE or FALSE, in which case the value is returned. Otherwise, NONE will be returned.
print any [1 none] 1
print any [none 1] 1
print any [none none] none
print any [false none] none
print any [true none] true
time: 10:30 if any [time > 10:00 time < 11:00] [print "time is now"] time is now
No other expressions are evaluated beyond the point where a successful value is found:
a: 0 any [none a: 2] print a 2
a: 0 any [1 a: 2] print a 0
day: 10 time: 9:45 ready: any [day > 5 time < 10:00 time: 12:00] print time 9:45
all - Shortcut AND. Evaluates and returns at the first FALSE or NONE.
and - Returns the first value ANDed with the second.
or - Returns the first value ORed with the second.
-From: giesse_writeme.com 7-Dec-2000/2:46:46-8:00:
A very useful use for ANY is to set default values. For example, if you have a word 'PORT that can hold a port number to use or NONE if the default value should be used, you can write:
port: any [port 80]
which will set 'PORT to 80 if it was NONE but will leave it untouched otherwise. The above is equivalent to:
port: either port [port] [80]
Using ANY in this case is much more convenient if you have more than one fallback value:
port: any [port fallback-port-1 fallback-port-2 80]
-From: giesse_writeme.com 7-Dec-2000/2:51-8:00:
Another use for ANY is to emulate a sequence of if...elseif...elseif...else. Instead of writing:
either cond-1 [ code-1 ] [ either cond-2 [ code-2 ] [ either cond-3 [ ][ ... ] ] ]
it is possible to write:
any [ if cond-1 [ code-1 true ; in case code-1 returns FALSE or NONE ] if cond-2 [ code-2 ] ... (default-code) ]