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###### tags: `Leetcode`
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# Leetcode 1119. Remove Vowels from a String

[link](https://leetcode.com/problems/remove-vowels-from-a-string/)

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Given a string `S`, remove the vowels `'a'`, `'e'`, `'i'`, `'o'`, and `'u'` from it, and return the new string.

#### Example 1:

Input: "leetcodeisacommunityforcoders"
Output: "ltcdscmmntyfrcdrs"

#### Example 2:

Input: "aeiou"
Output: ""

#### Constraints:

- S consists of lowercase English letters only.
- 1 <= S.length <= 1000

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Create a new string and append only consonants to the new string. Use a StringBuffer, which is initially empty, and loop over the original string S and add the consonants to the StringBuffer. Finally, return the string converted from the StringBuffer.

#### Solution 1

class Solution:
    def removeVowels(self, s: str) -> str:
        res = []
        for c in s:
            if c not in {'a', 'e', 'i', 'o', 'u'}:
                res.append(c)
                
        return ''.join(res)

O(T): O(N)
O(S): O(N)

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Using replace function to remove the vowels in the given string and return the original string without extra space.

#### Solution 2

class Solution:
    def removeVowels(self, s: str) -> str:
        replacements = ['a', 'e', 'i', 'o', 'u']
        for i in replacements:
            s = s.replace(i, "")

        return s

O(T): O(N)
O(S): O(1)