Different Categories of Array Deconstruction

While iterating through an array, I am utilizing destructuring.

const newArr = arr.map(({name, age}) => `${name} ${age}`)

An error occurs in the above code stating: Binding element 'name' implicitly has an 'any' type

To resolve this error, the following modification can be made:

const newArr = arr.map(({name, age}: { name: string; age: number }) => `${name} ${age}`)

Now, the question arises: Is there a more concise way to achieve the same result and/or apply the necessary types using an interface?


UPDATE: Integrating suggestions from comments and recommendations by @grumbler_chester and @TimWickstrom

I have discovered a shorter and cleaner approach to streamline my syntax:

Solution:

// User.tsx
interface User {
  name: string 
  age: number
}

const newArr = arr.map(({name, age}: User) => `${name} ${age}`)

Answer №1

To enforce stringent type checking, it is recommended to define your models within the file architecture of your project.

Here is an example of a file architecture:

/src
  /models
    Person.js

In the 'Person.js' file, you can define the model as follows:

export default {
  name: string,
  age: number
}

When working in your file, import 'Person' from './models/Person.js' // Path to Person.js

const newArr = arr.map(({name, age}:Person) => `${name} ${age}`)

If strict type checking is not necessary and you wish to suppress warnings, you can make the following adjustment in your 'tsconfig.json' file (https://www.typescriptlang.org/docs/handbook/tsconfig-json.html):

Change

"noImplicitAny": false,

to

"noImplicitAny": true,

Answer №2

If you provide type annotations for your arr variable, TypeScript will automatically deduce the types of the destructured fields.

To see an example of this in action, visit this playground link. Pay attention to the fact that noImplicitAny is set to true, resulting in an error for the mapping of arr0 but not for arr1.

For a deeper understanding of how TypeScript handles type inference, check out Type Inference.

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