A developer checks a numbered message card beside a sorting machine whose IF gate drops cards into reject and keep bins, with APPROVED, FOR...OF, COUNT and KEEP panels.

Select and Count Feedback

Martin Breuss
Martin Breuss 16 Lessons 3h 48m basics js
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How many delivery messages came in this week? A number is only useful if you can say which messages were counted and why. In this course, you’ll write the logic behind a small feedback report in JavaScript, step by step, inside supplied functions.

You’ll learn how to:

  • Ask one message a yes-or-no question with === and store the Boolean answer
  • Run code only when a condition holds, with an if block, and join two checks with &&
  • Visit every message in a list with a for...of loop
  • Count the messages that match, with a running count that starts at zero
  • Keep the matching messages themselves in a new list with push(), original IDs and all

You’ll finish with a project: a topic report that selects and counts approved messages on any requested topic, works on new lists, including empty ones, and that you can explain message by message.

You don’t need programming experience to get started and you won’t need to install anything because you’ll practice in interactive coding exercises right inside your browser.

What’s Included:

  • 16 Lessons
  • Video Subtitles and Full Transcripts
  • Translated Subtitles in 8 Languages
  • 1 Downloadable Resource
  • Interactive Quiz to Check Your Progress
  • 5 Hands-On Coding Exercises
  • Q&A With JavaScript Experts: Ask a Question
  • Certificate of Completion

Downloadable Resources:

Related Learning Paths:

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Ask One Message a Question

5 Lessons 1h 7m

  1. 1. Select and Count Feedback (Overview)01:50
  2. 2. Ask One Message a Yes-or-No Question23:00
  3. 3. Is This a Delivery Message?08:30
  4. 4. Decide What Happens With if19:00
  5. 5. Select by Topic and Review Status15:00

Count and Keep Matching Messages

6 Lessons 1h 29m

  1. 1. Many Messages in One List10:30
  2. 2. Visit Each Message With for...of03:58
  3. 3. Count Matching Messages24:00
  4. 4. Count Messages on Any Topic15:00
  5. 5. Keep the Messages Behind the Count21:30
  6. 6. Select Matching Messages15:00

Project: A Topic Report You Can Explain

3 Lessons 50m

  1. 1. Project: A Topic Report You Can Explain14:00
  2. 2. Build the Topic Report13:30
  3. 3. Explain Your Topic Report22:30

Reviewing What You've Learned

2 Lessons 21m

  1. 1. Reviewing What You've Learned06:30
  2. 2. Select and Count Feedback (Summary)15:00
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About Martin Breuss

Martin is Head of Content Strategy at RealJS. He came to programming from biology and has been teaching programming for more than ten years, as a coding mentor, code reviewer, curriculum developer, bootcamp instructor, and instructional designer.

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