You have one string of input bytes, output only the last byte in it.
Your submission may be a program or function outputting the last byte in the input which
I was trying to solve this with brainfuck, however all languages are allowed to participate. This is code-golf.
"?" -> "?"
"29845812674" -> "4"
This is a pretty basic answer, but I think that it is the lowest Python 3 can go...
x=lambda a:a[-1]
x= here
\$\endgroup\$
Commented
Mar 31, 2019 at 10:57
SELECT RIGHT(v,1)FROM i
Didn't see a SQL solution yet.
Input is via a pre-existing table \$i\$ with varchar field \$v\$, per our IO rules.
$_=chop
This must be executed using the -pe flags.
$ echo -n "abcd" | perl -pe '$_=chop'
d
The -p flag wraps code inside a block that appears as:
while (<>) { ... ; print } whereas the '...' would include the code provided. The entire script would expand to:
while (<>) { $_ = chop ; print }
What I did here was set the context variable $_ to the return value of chop, which returns the last character of a string. Shortly after, print with no statements on its own will display the previously assigned context variable.
_.last
Not much to say here - it's just a function that takes a string (or really any iterable) and outputs its last element.
┤Þ
Or alternatively:
b§
Explanation:
┤ # Pop the left character of the (implicit) input-string loose to the stack
Þ # Only leave the top item of the stack, and discard everything else
# (implicitly output the entire stack joined together)
b # Push -1
§ # Get the -1'th character of the (implicit) input-string
# (0-based modulair similar as Python, so will index into the last character)
# (implicitly output the entire stack joined together)
θ
# (implicit) push STDIN to stack
θ # push last character of top of stack
# (implicit) output top of stack to STDOUT
listen to S
cut S
say S at S-1
Try it here (Code will need to be pasted in)
Or 51 bytes if we need to be able to handle newlines in the input:
listen to S
while S
listen to S
cut S
say S at S-1
func main:
in ""
push ^1
push ^0
substr
print
ret
end
Commented:
func main:
; Get the input
in ""
; Get a substring of the input from (length - 1) to (length - 0)
push ^1
push ^0
substr
; Print it
print
ret
end
,>+[-,>+]<.
Explained:
,> [ ,> ] get input
+ - + sentinels
<. output last non-NUL byte (NUL doesn't count, doesn't it?)
There are two common ways of string processing: char lists and strings. In both cases, the underlying char is an 8 bit value using "extended ASCII".
For char lists:
hd o rev
I'm not sure why List.last isn't top-level, but that works too.
For strings, convert to List and use explode:
hd o rev o explode
Assumes every byte is a letter one of 0 through 9.
Is this justified?
s=>s%10+""
t, 0 bytesThat's right: no bytes. The t flag does all the work.
Or 1 byte flagless:
t
Built-in for last item.
