Name: Safely Access a Property on a JavaScript Array with Optional Chaining
Uploaded: 2020-04-03T13:21:33-05:00
Description: You can use optional chaining to access elements in an array. If the array is null or undefined, attempting to access an element with optional chaining prevents an error from being thrown, returning undefined instead.

Copy an Array with the Spread Operator

Nested Destructuring for Objects

Copy an Object with the Spread Operator

Merge Arrays using the Spread Operator

Flatten a Nested Array in JavaScript with Array.prototype.flat

Merge Objects with JavaScript's Spread Operator

For...in Loop vs. For...of Loop

Array.prototype.flatMap from ES2019

Convert an Object to an Array and back again with Object.entries and Object.fromEntries

Safely Access a Property on a JavaScript Object with Optional Chaining

Safely Access a Property on a JavaScript Array with Optional Chaining

ES6 and Beyond

You can use optional chaining to access elements in an array. If the array is null or undefined, attempting to access an element with optional chaining prevents an error from being thrown, returning undefined instead.

https://app.egghead.io/api/v1/lessons/egghead-safely-access-a-property-on-a-javascript-array-with-optional-chaining/subtitles

Laurie Barth: [0:00] Define an array with the elements 1, 2, and 3. We can access the first element of the array index zero. If we define a new array that's null and attempt to access the first element, we'll get an error. Instead, we can use optional chaining, ?., to access that element. Now we will safely receive undefined.

Safely Access a Property on a JavaScript Array with Optional Chaining

Share this video with your friends

Course

ES6 and Beyond