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The Clojure Workshop

You're reading from  The Clojure Workshop

Product type Book
Published in Jan 2020
Publisher Packt
ISBN-13 9781838825485
Pages 800 pages
Edition 1st Edition
Languages
Authors (5):
Joseph Fahey Joseph Fahey
Profile icon Joseph Fahey
Thomas Haratyk Thomas Haratyk
Profile icon Thomas Haratyk
Scott McCaughie Scott McCaughie
Profile icon Scott McCaughie
Yehonathan Sharvit Yehonathan Sharvit
Profile icon Yehonathan Sharvit
Konrad Szydlo Konrad Szydlo
Profile icon Konrad Szydlo
View More author details

Table of Contents (17) Chapters

Preface 1. Hello REPL! 2. Data Types and Immutability 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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