Software Engineering

Symbols, Iteration, and Asynchronous JavaScript

Master the protocols and async machinery powering modern JavaScript: Symbols, iterators, generators, lazy pipelines, Promises, `async`/`await`, and async iteration with `for await…of`. Write code that integrates naturally with language features.

JavaScript

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5 lessons

20 practices

3 hours

Computer Science Fundamentals

Course details

Understanding JavaScript Symbols

Preview

Protecting Property Keys with Symbols

Perfecting Your Symbol Logic

Make Your Objects Feel Native

Mastering Advanced Object Customization

Previous Course Next Course: Meta-Programming and Advanced Integration Patterns

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I love that it's personalized. When I'm stuck, I don't have to hope my Google searches come out successful. The AI mentor Cosmo knows exactly what I need.

Faith Yim

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It's an amazing product and exceeded my expectations, helping me prepare for my job interviews. Hands-on learning requires you to actually know what you are doing.

Alex Bush

Full Stack Engineer

I'm really impressed by the AI tutor Cosmo's feedback about my code. It's honestly kind of insane to me that it's so targeted and specific.

Abbey Helterbran

Tech consultant

I tried Leetcode but it was too disorganized. CodeSignal covers all the topics I'm interested in and is way more structured.

Jonathan Miller

Senior Machine Learning Engineer

+12

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

From our community

Hear what our customers have to say about CodeSignal Learn

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

I love that it's personalized. When I'm stuck, I don't have to hope my Google searches come out successful. The AI mentor Cosmo knows exactly what I need.

Faith Yim

Software Engineer

+14

It's an amazing product and exceeded my expectations, helping me prepare for my job interviews. Hands-on learning requires you to actually know what you are doing.

Alex Bush

Full Stack Engineer

I'm really impressed by the AI tutor Cosmo's feedback about my code. It's honestly kind of insane to me that it's so targeted and specific.

Abbey Helterbran

Tech consultant

I tried Leetcode but it was too disorganized. CodeSignal covers all the topics I'm interested in and is way more structured.

Jonathan Miller

Senior Machine Learning Engineer

+12

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

Symbols, Iteration, and Asynchronous JavaScript

Course details

Unit 14 practices32 min

Unit 24 practices32 min

Unit 34 practices32 min

Unit 44 practices32 min

Unit 54 practices32 min

Turn screen time into skills time

Join the 1M+ learners on CodeSignal

From our community

From our community