Comments on Just the vowels please
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Just the vowels please
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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