REBOL 3 Functions: back

back series

Returns the series at its previous position.

Arguments:

series [series! gob! port!]

Description

Works on any type of series. If the series is at its head, it will remain at its head. back will not go past the head, nor will it wrap to the tail.

print back tail "abcd"
d

str: tail "time"
until [
    str: back str
    print str
    head? str
]
e
me
ime
time

blk: tail [1 2 3 4]
until [
    blk: back blk
    print first blk
    head? blk
]
4
3
2
1