How to pass TypeScript enum as array with all Enums?

Question

I have method export const getMatchPicks = (match: IMatch, ends: EndType[]): IPick[] => ends.map(end => matchToPick(match, end));

Also, I have:

enum EndType {
    HOME = 'home',
    DRAW = 'draw',
    AWAY = 'away',
}

My goal call getMatchesPicksList function passing EndType enums as array:

 getMatchesPicksList(matches, [EndType.HOME, EndType.AWAY, EndType.DRAW])

The code above has been compiled correctly. But what if I will have n length enum? How to pass it to function?

I expect something like getMatchesPicksList(matches, EndType) , but it returns:

error TS2345: Argument of type 'typeof EndType' is not assignable to parameter of type 'EndType[]'. Property 'includes' is missing in type 'typeof EndType'.

so, you want a way to get all the values from a string enum? — toskv
– toskv, Commented Feb 28, 2018 at 20:24

jcalz · Accepted Answer · 2018-02-28 20:34:07Z

1

Well, getMatchesPicksList() doesn't take the EndType enum object directly. It takes an array of property values of the EndType enum object. It is a bit confusing that EndType refers to a value (the enum object) as well as a type (the string property values, something like the union 'home' | 'draw' | 'away').

If you want to turn a string enum object into an array of its property values, you could make a function to do it:

function getStringEnumValues<E extends Record<keyof E, string>>(e: E): E[keyof E][] {
  return (Object.keys(e) as (keyof E)[]).map(k => e[k]);
}

And then call your function on its result:

getMatchesPicksList(matches, getStringEnumValues(EndType));

If you are trying to do something else, please give more information. Hope that helps; good luck!

answered Feb 28, 2018 at 20:34

jcalz

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