apropos-cast/00 Show Notes.md

## 00 Show Notes.md

      
        

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              00 Show Notes.md
            
          
        
      
      
    Show date: February 6, 2020
Topics
Multi-stage builds in Docker
Markdown Editor Single Page Application
50% off during launch: https://purelyfunctional.tv/courses/markdown-editor/
REPL Exercise
Parse query parameters
URLs can have optional query parameters. They are the key-value pairs that follow the path.
Write a function that takes a URL (represented as a string) and parses out the query parameters into a hashmap.
Notes:

The query string is the string containing the query parameters. It appears after the ? and before a #. Ex: https://lispcast.com/search?q=clojure#page2
The keys and values are URL Encoded. You can use java.net.URLDecoder/decode to decode them.
The key-value pairs are separated by &. Ex: a=1&b=2
Each key-value pair contains the key, followed by =, followed by the value. Ex: a=1

Bonus:
Query parameters can contain duplicate keys. Handle them gracefully.