/TypeScript/Haskell get specific elements of a String

Haskell get specific elements of a String

onlyParenthesis :: String -> String
onlyParenthesis [] = []
onlyParenthesis (x:xs)
                 | x /= '(' && x /= ')' && x /= '[' && x /= ']' && x /= '{' && x /= '}'= onlyParenthesis xs
                 | otherwise = x : onlyParenthesis xs

Similar codes

0 vote164 views1 answer
Acces arrey lements without comma
TypeScript
0 vote174 views1 answer
The eval() function
TypeScript
0 vote192 views1 answer
How to create nest without spec test filefile
TypeScript
0 vote156 views1 answer
Typescript get object value
TypeScript
1 vote166 views1 answer
DbQueryEventNode
TypeScript
0 vote182 views1 answer
Products = product.object.all() python
TypeScript
0 vote163 views1 answer
Paginator
TypeScript
0 vote214 views1 answer
Property 'length' does not exist on type 'T'
TypeScript
0 vote220 views1 answer
Copy all elements from one list to another ajav
TypeScript
0 vote193 views2 answers
Cannot find module 'tns-core-modules/platform' or its corresponding type declarations
TypeScript