Sinc02 Posts - Answer Overflow

Sinc02

•Created by Sinc02 on 1/15/2024 in #front-end

Union of literal types from an array of strings

Hi I'm looking for a way to generate a union type for every string in an array. Let's say I have an array const sample = ["apple", "banana", "grape", "orange""]. Basically I want to be able to get type SomeType = "apple" | "banana" | "grape" | "orange". I need this SomeType because I need to create a function that accepts one of these values instead of typing them one by one like this

const aFunction = (text: "apple" | "banana" | "grape" | "orange") => {
  // do something with text
}

const aFunction = (text: "apple" | "banana" | "grape" | "orange") => {
  // do something with text
}

As you can see it'll be a lot of work to do the typing if the number of items in the array keeps increasing (let's say like 100 items). I just want a union type that consists of the literal types of whatever strings that are in the array (in this case sample). How can I do this in typescript?

6 replies

KPCKevin Powell - Community

•Created by Sinc02 on 12/14/2022 in #front-end

Grid col span to the end if a single item exists in a row

3 replies

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