Is it possible to nullify an object and utilize nullish coalescing for handling potentially undefined constants?

Question

Is it possible to nullify an object and utilize nullish coalescing for handling potentially undefined constants?

In my development work with React, I often utilize a props object structured like this:

const props: { id: number, name?: string} = { id: 1 }; // 'name' property not defined
const { id, name } = props; // the 'name' constant is now forever undefined, even when using defaultProps in React and receiving warnings from Typescript about potential undefined values

Is there a method to incorporate nullish coalescing while destructuring the object?

Note that I am unable to use the following code snippet (due to an ESlint rule enforced by the team):

const name = props.name ?? 'placeholder name';

typescript react-typescript object-destructuring nullish-coalescing

Answer 1

Answer №1

If the variable name is not defined, you can set a default value without relying on optional chaining:

const { id, name = 'default name' } = props;

Answer 2

If the variable name is not defined, you can set a default value without relying on optional chaining:

const { id, name = 'default name' } = props;

Answer 3

Answer №2

In order to troubleshoot this potential issue, I take the following steps:

For instance:

const defaultValue = 'Unknown';

let {firstName, num, surname} = individual;

$('#division_Test').append(`<p>First Name: ${firstName ?? defaultValue}, Number: ${num ?? defaultValue }, Surname: ${surname ?? defaultValue}</p>`

I specifically utilized nullish coalescing when working with these variables.

Answer 4

In order to troubleshoot this potential issue, I take the following steps:

For instance:

const defaultValue = 'Unknown';

let {firstName, num, surname} = individual;

$('#division_Test').append(`<p>First Name: ${firstName ?? defaultValue}, Number: ${num ?? defaultValue }, Surname: ${surname ?? defaultValue}</p>`

I specifically utilized nullish coalescing when working with these variables.

Is it possible to nullify an object and utilize nullish coalescing for handling potentially undefined constants?

Answer №1

Answer №2

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