Skip to content

Object destructuring with types in TypeScript

The Valley of Code

Your Web Development Manual

I was using TypeScript in Deno to build a sample project and I had to destructure an object. I am familiar with TypeScript basics but sometimes I hit a problem.

Object destructuring was one of those.

I wanted to do

const { name, age } = body.value

I tried adding the string and number types like this:

const { name: string, age: number } = body.value

But this didn’t work. It apparently worked, but in reality this is assigning the name property to the string variable, and the age property value to the number variable.

The correct syntax is this:

const { name, age }: { name: string; age: number } = body.value

The best way to approach this would be to create a type or interface for that data:

interface Dog {
  name: string
  age: number

Then you can write the above in this way, which is shorter:

const dog: Dog = body.value
→ Get my JavaScript Beginner's Handbook
→ Read my JavaScript Tutorials on The Valley of Code
→ Read my TypeScript Tutorial on The Valley of Code
  • THE VALLEY OF CODE (+ PRO), your web development manual
  • I wrote 15+ free coding BOOKS, download them here
  • SOLOPRENEUR LAND the missing MBA for wannabe solopreneurs craving a life with more freedom, control, fulfillment and purpose (summer 2024)