JavaScript Problem: What is the Output?

In this tutorial we are going to look at a code snippet I saw in the learnJavaScript subreddit. It is great for testing three pieces of JavaScript knowledge which are: an understanding of Sets; the use of the rest/spread operator; and the use of the reduce array method.
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Tutorials referred to in this video:
The spread operator: • Using the JavaScript S...
Understanding Sets: • JavaScript Problem: Us...
Reduce method: • The Magic of the reduc...
Arrow functions: • Arrow Functions
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#javascript #AllThingsJavaScriptLLC

[@arunkaiser]

Today whole day I took your courses only 😍 from Udemy and KZbin ▶️

[@AllThingsJavaScript]

Thanks!!

[@akshay__sood]

Without watching- My answer is 25 After watching- My answer matched with your, yay!

[@udayasrireddygangappagari2990]

Howw

[@polliluiz]

Thank you Steven. Really an excellent video.

[@dhaneshdhanawade]

Please take more tricky examples

[@rolandpierrelouis4013]

Thank you for your cool lessons. Do you teach about Design Patterns in JS please ?

[@AllThingsJavaScript]

I've done some tutorials on patterns: kzbin.info/aero/PLTo9PCskHpbFyc3v6ALjvb8HuzHsvt43r Are there specific design patterns you need?

[@razeev4685]

I am very confused regarding the fetch API . Why there are two ".then" and How response and data parameter is used to fetch the actual data from the server?

[@AllThingsJavaScript]

Fetch returns a promise, so we use the first .then for that promise. Then we need to use the json method to convert to JSON. That also returns a promise, so we need another .then. I hope that helps.