REBOL 3 Functions: for

for word start end bump body

Evaluate a block over a range of values. (See also: REPEAT)

Arguments:

word [word!] - Variable to hold current value

start [series! number!] - Starting value

end [series! number!] - Ending value

bump [number!] - Amount to skip each time

body [block!] - Block to evaluate

Description

The first argument is used as a local variable to keep track of the current value. It is initially set to the START value and after each evaluation of the block the BUMP value is added to it until the END value is reached (inclusive).

for num 0 30 10 [ print num ]
30

for num 4 -37 -15 [ print num ]
-26