Skip to content

Object destructuring with types in TypeScript

New Course Coming Soon:

Get Really Good at Git

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
Are you intimidated by Git? Can’t figure out merge vs rebase? Are you afraid of screwing up something any time you have to do something in Git? Do you rely on ChatGPT or random people’s answer on StackOverflow to fix your problems? Your coworkers are tired of explaining Git to you all the time? Git is something we all need to use, but few of us really master it. I created this course to improve your Git (and GitHub) knowledge at a radical level. A course that helps you feel less frustrated with Git. Launching May 21, 2024. Join the waiting list!
→ Get my JavaScript Beginner's Handbook
→ Read my JavaScript Tutorials on The Valley of Code
→ Read my TypeScript Tutorial on The Valley of Code

Here is how can I help you: