Reverse a string by chunks
Jelly, 2 bytes
sṚ
A full program that prints the result.
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How?
sṚ - Main link: string, number e.g. 'abcdefg', 3
s - split string into chunks of length number (keeping any overflow) ["abc","def","g"]
Ṛ - reverse the resulting list ["g","def","abc"]
- implicit print gdefabc
Python 3, 35 bytes
f=lambda s,n:s and f(s[n:],n)+s[:n]
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05AB1E, 5 4 3 bytes
-1 thanks to Dennis
-1 thanks to carusocomputing
ôRJ
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# Implicit: push input
ô # Split in pieces of length b
RJ # Reverse and join