JavaScript Array Methods: reduce()

Publicado em: 17 Dezembro 2022
no canal de: Treehouse

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The reduce() method in JavaScript is used to apply a function to each element in an array, with the purpose of reducing the array to a single value. It has some relatively straightforward applications such as calculating the sum or average of the elements in an array. However, it can also perform more complex operations, including flattening a multi-dimensional array into a single-dimensional array, counting the occurrences of a particular element in an array, converting an array of objects into a single object, filtering an array based on a condition, and more. Learn how to use reduce() with Dustin as he reviews some use cases and the official documentation. Start your free trial to learn more! http://bit.ly/3LhQIO3

Blog article:
http://bit.ly/42ayx2N

Related courses:
JavaScript Basics: http://bit.ly/3FmPY6G

Resources:
MDN–reduce(): https://developer.mozilla.org/en-US/d...

Chapters:
0:00 Intro
0:26 What is reduce()?
0:50 Syntax and parameters
2:42 Getting the sum with reduce()
3:30 Get the average with reduce()
4:00 Convert multi-dimensional array to a single with reduce()
5:00 Get even numbers from array with reduce()
5:32 Convert array of objects to object with reduce()
6:12 Final thoughts

#javascript #html #coding

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