tvl-depot/users/wpcarro/scratch/facebook/reverse-string-in-place.py

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# reverse :: [Char] -> ()
def reverse(xs):
i = 0
j = len(xs) - 1
while i < j:
xs[i], xs[j] = xs[j], xs[i]
i += 1
j -= 1
xs = [list("testing"), list("a"), list("to")]
for x in xs:
print(x)
reverse(x)
print(x)