UNLESS Another way of writing IF NOT
CONTROLS
UNLESS condition block
condition - condition to NOT be true
block - block to execute under appropriate condition
This method has no refinements
UNLESS This is another way of writing IF NOT. The Rebol3 documantation says the following about UNLESS:
"This function can take some getting used to. It has been provided to make PERL programmers happier, and it's marginally simpler and faster than writing an if not expression."
Descriptions and
condition?: false
unless condition? [write "condition was not true!"]