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nathan-cruz77/fold.py

Created August 22, 2019 03:13
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Fold iterable
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fold.py
from itertools import chain
# Fold iterable into itself.
#
#
# Sample usage:
#
# >>> list(fold([1, 2, 3]))
# [1, 2, 3, 2, 1]
#
# >>> list(fold([1, 2]))
# [1, 2, 1]
#
def fold(iterator):
reverse = reversed(iterator)
next(reverse, None)
return chain(iterator, reverse)
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