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The Clojure Workshop

You're reading from   The Clojure Workshop Use functional programming to build data-centric applications with Clojure and ClojureScript

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Product type Paperback
Published in Jan 2020
Publisher Packt
ISBN-13 9781838825485
Length 800 pages
Edition 1st Edition
Languages
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Authors (5):
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Konrad Szydlo Konrad Szydlo
Author Profile Icon Konrad Szydlo
Konrad Szydlo
Yehonathan Sharvit Yehonathan Sharvit
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Yehonathan Sharvit
Scott McCaughie Scott McCaughie
Author Profile Icon Scott McCaughie
Scott McCaughie
Thomas Haratyk Thomas Haratyk
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Thomas Haratyk
Joseph Fahey Joseph Fahey
Author Profile Icon Joseph Fahey
Joseph Fahey
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Table of Contents (17) Chapters Close

Preface 1. Hello REPL! 2. Data Types and Immutability FREE CHAPTER 3. Functions in Depth 4. Mapping and Filtering 5. Many to One: Reducing 6. Recursion and Looping 7. Recursion II: Lazy Sequences 8. Namespaces, Libraries and Leiningen 9. Host Platform Interoperability with Java and JavaScript 10. Testing 11. Macros 12. Concurrency 13. Database Interaction and the Application Layer 14. HTTP with Ring 15. The Frontend: A ClojureScript UI Appendix

Errors in JavaScript

In the previous section, we learned about errors and exceptions in Java and how to handle them in Clojure. Unexpected situations that lead to problems in JavaScript applications also happen. This results in a need to handle errors. JavaScript does not distinguish between errors and exceptions, so any situations in which code causes the application not to run as expected are errors.

Like in Java, in JavaScript, we have tools to deal with errors. JavaScript provides four constructs:

  • throw
  • try
  • catch
  • finally

They are the same as we saw in the previous section. JavaScript reuses error handling concepts known from other languages, such as Java. Because JavaScript is not Java, the way we deal with errors in ClojureScript is not 100% the same as in Clojure. It's very close, but code pasted from Clojure to ClojureScript will not work straight away. In the next exercise, we will see how to deal with JavaScript errors in ClojureScript and...

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