How to declare an array with more than one type in TypeScript?

Question

I'm writing a function in which one of the arguments is an array that can have strings or numbers:

function functionName(argumentOne: string, argumentTwo: string, argumentThree: string[] | number[]) {
  ...
}

One instance of argumentThree: ["string1", 2, "string3"]

string[] is an array of strings and number[] is an array of numbers. Therefore my code is giving me an error.

Array<string | number>

Rajesh Kanna
– Rajesh Kanna

2022-11-25 08:50:42 +00:00
Commented Nov 25, 2022 at 8:50 — Rajesh Kanna
– Rajesh Kanna, Commented Nov 25, 2022 at 8:50

CollinD · Accepted Answer · 2022-11-25 08:50:45Z

5

You can use a union type for this:

//        alternatively: Array<string | number>
function myFunction(arr: (string | number)[]) {
  for (const element of arr) {
    // typeof element => string | number
  }
}

answered Nov 25, 2022 at 8:50

CollinD

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Ryan Le · Accepted Answer · 2022-11-25 08:52:39Z

2

Hope this helps:

function functionName(argumentOne: string, argumentTwo: string, argumentThree: Array<string | number>) {
  ...
}

answered Nov 25, 2022 at 8:52

Ryan Le

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