All - Function Summary

Summary:

Shortcut AND. Evaluates and returns at the first FALSE or NONE.

Usage:

all block

Arguments:

block - Block of expressions (must be: block)

Description:

Evaluates each expression in a block until one of the expressions returns NONE or FALSE, in which case a NONE is returned. Otherwise, the value of the last expression will be returned.

print all [1 none]
none

print all [none 1]
none

print all [1 2]
2

print all [10 > 1 "yes"]
yes

print all [1 > 10 "yes"]
none

time: 10:30
if all [time > 10:00 time < 11:00] [print "time is now"]
time is now

No other expressions are evaluated beyond the point where a value fails:

a: 0
all [none a: 2]
print a
0

a: 0
all [1 a: 2]
print a
2

day: 10
time: 9:45
ready: all [day > 5  time < 10:00  time: 12:00]
print time
12:00

Related:

and - Returns the first value ANDed with the second. any - Shortcut OR. Evaluates and returns the first value that is not FALSE or NONE. or - Returns the first value ORed with the second.