Back - Function Summary
Summary:
Returns the series at its previous position.
Usage:
back series
Arguments:
series - The series argument. (must be: series port)
Description:
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.
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 |
Related:
head - Returns the series at its head.
head? - Returns TRUE if a series is at its head.
last - Returns the last value of a series.
next - Returns the series at its next position.
tail - Returns the series at the position after the last value.
tail? - Returns TRUE if a series is at its tail.
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