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Challenges

Just the vowels please

+4
−0

Given a sequence of letters, output only the vowels.

Input

  • A sequence of letters
  • This may be a string or any ordered data structure of characters (provided it is consistent between inputs)
  • The letters may contain a mixture of upper and lower case
  • The characters that count as letters for this challenge are A-Z and a-z, specifically ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
  • The input may be empty (it may have length zero)

Output

  • All of the vowels from the input, in the same order, and nothing else
  • This may be a string or any ordered data structure of characters. It does not need to match the input format (provided it is consistent between inputs)
    • For example, you may take input as an array of characters, and output as a string, provided this does not change for different inputs
  • Vowels that appear more than once in the input must appear the same number of times in the output
  • If there are no vowels in the input, the output is empty (a sequence of length zero)
  • The characters that count as vowels for this challenge are AEIOUaeiou
  • Case must be maintained - a vowel that is lower case in the input must be lower case in the output, and a vowel that is upper case in the input must be upper case in the output

Test cases

Test cases are in the format "input" : "output"

"" : ""
"q" : ""
"S" : ""
"Rhythm" : ""
"a" : "a"
"art" : "a"
"atr" : "a"
"rat" : "a"
"rta" : "a"
"tar" : "a"
"tra" : "a"
"emu" : "eu"
"eum" : "eu"
"meu" : "eu"
"mue" : "ue"
"uem" : "ue"
"ume" : "ue"
"AaeEIiOouU" : "AaeEIiOouU"
"aaaaaaaa" : "aaaaaaaa"
"bbbbbbbb" : ""
"abababab" : "aaaa"
"babababa" : "aaaa"
"aLtErNaTe" : "aEae"

Explanations are optional, but I'm more likely to upvote answers that have one.

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1 comment thread

Is `null` a valid output if there are no vowels? (2 comments)

9 answers

+2
−0

Vyxal, 2 bytes

~A

Try it Online!

Takes input as a string, outputs a list of vowels.

Explained

~A
~   # Keep only letters from the input where
 A  # the letter is a vowel
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+2
−0

J, 19 char

Solution:

(e.&'aeiouAEIOU'#])

Test examples:

   (e.&'aeiouAEIOU'#]) ''

   (e.&'aeiouAEIOU'#]) 'Rhythm'

   (e.&'aeiouAEIOU'#]) 'a'
a
   (e.&'aeiouAEIOU'#]) 'emu'
eu
   (e.&'aeiouAEIOU'#]) 'aLtErNaTe'
aEae

How it works:

] is whatever value is on the the far right
# uses boolean value on its left to select from value on its right
'aeiouAEIOU' are the characters being searched for
& ties the value on its right to the verb on its left
e. searches for the values on its right within the value on its left 
   producing a boolean result for found / not found
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+2
−0

Vyxal, 3 bytes

k∨↔

Try it Online!

  ↔ # Keep chars from
k∨  # vowels
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+2
−0

Fig, 3 bytes

Actual score is: $3\log_{256}(96)\approx$ 2.469 bytes. Filters consonants from the input string using implicit input.

Fcb

Try it online!

Fcb
F   : Filter with two string args filters a from b
 cb : constant for upper/lowercase consonants
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+1
−0

05AB1E, 3 bytes

žÀÃ

   : implicit input
žÀ : push "aeiouAEIOU"
à : keep all elements of input that occur in "aeiouAEIOU"

Try it online!

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+1
−0

JavaScript, 27 24 bytes

Input as a string, output as a character array or empty array.

s=>s.split(/[^aeiou]*/i)

Try it online!

Thanks to Moshi for pointing out the * I was missing that would allow me to use split instead of match and get down to 24 bytes.

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24 bytes (4 comments)
+1
−0

Raku, 18 bytes

{m:g:i/<[aeiou]>/}

Implicitly matches the topic variable with the regex

Try it online!

{m:g:i/<[aeiou]>/}
{                }  : anonymous code block
 m                  : match operator
  :g:i              : regex adverbs, global and ignorecase
      /<[aeiou]>/   : the regex using a character class of vowels
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+1
−0

Japt v2.0a0, 3 bytes

o\v

Try it

o\v     :Implicit input of string
o       :Keep only
 \v     :RegEx /[aeiou]/gi
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+1
−0

Sclipting, (UTF-16) 22 bytes

놵멡뉖땯더굅낔뭕뇐虛移

Nothing complicated, just replaces the regex [^aeiouAEIOU] with the empty string.

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