javascript - How do I parse a string to number while destructuring?

Question

I am trying to experiment around destructuring assignment. Now I have a case which I trying to cop up with destructuring itself.

For example, I have an input like this:

let input = {latitude: "17.0009", longitude: "82.2108"}

Where latitude and longitude key values are strings, but I want to parse them into a number while destructuring.

let input = {latitude: "17.0009", longitude: "82.2108"}
let {latitude,longitude} = input

console.log(typeof latitude,typeof longitude)

Answer 1

Destructuring is just a nice way to unpack properties from objects and arrays and assign them to variables. As the trasnpiled code in the question suggests, any kind of operation is not possible.

One hack would be to create 2 more variables (which don't exist in input) and set the default value to the number equivalent of the previously destrucutred properties:

let input = { latitude: "17.0009", longitude: "82.2108" }
let { latitude, longitude, lat = +latitude, long = +longitude } = input

console.log(typeof latitude, typeof longitude, typeof lat, typeof long)