CODEWITHSUNDEEP
elm
Chris
Chris

Reputation: 934

Compare char to string in Elm

I'd like to loop through the characters of a string and see if each is contained in another string. However, String.toList returns a list of Chars, not Strings, which isn't allowed by the String.contains function. Passing the Char to toString doesn't help, is there another way to achieve this goal, or do I just need another approach altogether?

> String.contains (toString 'a') "asdf"
False : Bool

Upvotes: 0

Views: 1732

Answers (2)

MarkDBlackwell
MarkDBlackwell

Reputation: 2122

Use lists of characters directly:

> standard  = String.toList "asdf"
['a','s','d','f'] : List Char

> candidateGood = String.toList "asd"
['a','s','d'] : List Char

> candidateBad = String.toList "abc"
['a','b','c'] : List Char

> List.all (\x -> List.member x standard) candidateGood
True : Bool

> List.all (\x -> List.member x standard) candidateBad
False : Bool

Upvotes: 1

halfzebra
halfzebra

Reputation: 6807

Use String.fromChar to convert a character to string.

String.fromChar 'a' -- "a"
String.contains (String.fromChar 'a') "asdf" -- True

Upvotes: 10

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