Verifying the absence of values in destructured variables

Question

Verifying the absence of values in destructured variables

In my code, I have set up three constants based on an object.

const {standing_bid_amt, min_increment, starting_price} = props.auction.auction;

The problem arises when the object auction is empty, resulting in the constants being undefined. To address this issue, I have modified the code to

const {standing_bid_amt, min_increment, starting_price} = props.auction.auction 
  ? props.auction.auction 
  : {standing_bid_amt: null, min_increment:null, starting_price:null};

While this solution works, I have a feeling that there might be a better way to handle null checks for these constants. Please share if there is a more efficient approach to create these constants with a proper null check.

javascript ecmascript-6

Answer 1

Answer №1

Instead of using the conditional operator, consider using curly braces instead and set default values (null) for the destructured variables. This way, if the right-hand side of the assignment evaluates to an empty object, null will be assigned to the variables:

const {
  standing_bid_amt = null,
  min_increment = null,
  starting_price = null
} = props.auction.auction || {};

const doSomething = (props) => {
  const {
    standing_bid_amt = null,
    min_increment = null,
    starting_price = null
  } = props.auction.auction || {};
  console.log(min_increment);
};

doSomething({ auction: {auction: null }});
doSomething({ auction: {auction: {
  standing_bid_amt: 50,
  min_increment: 50,
  starting_price: 50
}}});

Answer 2

Instead of using the conditional operator, consider using curly braces instead and set default values (null) for the destructured variables. This way, if the right-hand side of the assignment evaluates to an empty object, null will be assigned to the variables:

const {
  standing_bid_amt = null,
  min_increment = null,
  starting_price = null
} = props.auction.auction || {};

const doSomething = (props) => {
  const {
    standing_bid_amt = null,
    min_increment = null,
    starting_price = null
  } = props.auction.auction || {};
  console.log(min_increment);
};

doSomething({ auction: {auction: null }});
doSomething({ auction: {auction: {
  standing_bid_amt: 50,
  min_increment: 50,
  starting_price: 50
}}});

Verifying the absence of values in destructured variables

Answer №1

Similar questions

How can I prevent opening duplicate tabs of the same website simultaneously?

Removing classes from multiple cached selectors can be achieved by using the .removeClass

Determine the duration/length of an audio file that has been uploaded to a React application

React dynamic table

How to retrieve multiple values from a single select dropdown form field using React

Firefox has various problems, but it functions flawlessly in Chrome without any problems

"Utilizing AJAX to dynamically extract data from PHP and manipulate it in a multi-dimensional

When I open Firefox, all I see is a blank page with only the h2 heading displayed

What steps can I take to modify my webpage, like a dashboard, on the internet?

Guide on creating a custom type for an object utilizing an enum framework

Guidelines for cycling through a series of HTTP requests and effectively saving the data from each cycle into an array

Event to discard currently selected pushpin in Bing Maps v8

Top method for transitioning FontAwsome stars class from regular to solid

"Customize your text alignment with TinyMCE's align

Spin an icon when the Button it is inside of is clicked

Is there a way to prevent the Material UI Chip component from appearing when there is no content present?

What is the best way to determine if an object.property is defined in Angular 2?

Embed JavaScript code in the head section of the webpage to guarantee its presence even following a page refresh

Auto-filling a form with the selected 'id' in Django using JavaScript or AJAX

Is there a way to trigger a function in an AngularJS controller from a Backbone controller?