Functions and Interfaces Working Together in TypeScript

How to add types to functions and use interfaces in TypeScript

How to add types to functions and use interfaces in TypeScript

Welcome to the land of TypeScript! A superset of the JavaScript language where every value has a type associated with it.

If you are new to TypeScript, check out the article below to get an introduction to type annotation and type inference.

In this article, we will take a look at how to handle types in functions. We will first look at how to annotate function types, then take a look at how to use interfaces with functions.

Adding types to functions

When adding types to functions, there are two places to be aware of. Types for the arguments, and the type for the return value.

To annotate types for arguments, simply add a colon and the type next to the parameter.

To add a type to the output, add a colon after the argument list with the type of the return value. The code below shows a basic function with the types annotated. Now, TypeScript knows that the add function will accept two arguments of type number, and return a value with type number.

const add = (a: number, b: number): number => {
  return a + b;
};

You can do the same using named functions and anonymous functions as well.

function add(a: number, b: number): number {
  return a + b;
};

const add = function(a: number, b: number): number {
  return a + b;
};

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