Is it necessary for every input parameter in Typescript to be an object with an interface, even if it is straightforward?

Is it necessary to use Typescript interfaces for every input parameter? If not, when should they be used and when should they not be used?

For instance, is it appropriate to have the following setup?

interface IOne {
   myFirstVal: string
}

interface ITwo {
   mySecondVal: number
}

function one (input: IOne) {
  const { myFirstVal } = input
  ...
}

function two (input: ITwo) {
  const { mySecondVal } = input
  ...
}

If the above scenario doesn't make sense, should I just pass primitive values like this:

function one (myFirstVal: string) { ... }

What criteria should be used to determine when to use primitives instead of defined objects as shown in the initial example?

Answer №1

In my opinion, the need for interfaces or types in a program depends on the specific context and how you are structuring your data. Sometimes, it is essential to create an interface or type for certain elements. For instance, when defining a Person, using an interface can be beneficial as we can anticipate its properties and structure. An example of such an interface could be:

interface Person {
    name: string;
    hobbies: string[];
    weight: number;
}

On the other hand, if we are dealing with a single value like a password, it may simply require a primitive type. In such cases, we can declare the variable directly in our program, such as:

let password: string = "my password";

Considering the scenario with IOne and ITwo, one should evaluate whether these truly need to be objects. While an interface can consist of just one value, it is worth questioning if that complexity is necessary. Perhaps utilizing a primitive type would suffice.

The main objective of TypeScript is not to enforce the use of interfaces everywhere but rather to enhance program durability and assist in identifying errors during development.

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