Encountering a TypeScript error when attempting to utilize indexOf on a Typed Array, leading to restriction

I have been working with an Interface, where I created an array of type Interface. I am currently facing some IDE error complaints when trying to use the .indexOf method on the Array. These errors seem confusing to me, and I'm hoping someone here might be able to offer a solution.

Interface

export interface IAddress {
  name: string,
  registrationId: number
}

Code

let friends: IAddress[];

// assume friends has a few elements...

let index = friends.indexOf((friend: IAddress) => {
  return !!(friend.name === 'some name');
});

TypeScript Errors:

Argument of type '(friend: IAddress) => boolean' is not assignable to parameter of type 'IAddress'.
Type '(friend: IAddress) => boolean' is missing the following properties from type 'IAddress': registrationId

If I were to remove the :IAddress from the typed def next to friend: I see this error instead.

Argument of type '(friend: any) => boolean' is not assignable to parameter of type 'IAddress'.
Type '(friend: any) => boolean' is missing the following properties from type 'IAddress': registrationId
javascripttypescripttypescript-typings

Answer №1

Array.prototype.indexOf() function requires a searchElement parameter and an optional fromIndex parameter.

As suggested by @Pixxl in the comment, consider using Array.prototype.findIndex() to retrieve the position of an element within an array:

const friends: IAddress[];

// assuming the 'friends' array contains multiple elements...
const index = friends.findIndex((friend: IAddress) => friend.name === 'some name');

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