There are times I am writing a small snippet of code to share withs
someone or just to test an idea on my own. I don’t necessarily need
the full power of Xcode, so CodeRunner comes in quit handy. It’s even
more useful in its support of other languages like Ruby and
JavaScript. source.
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Pros
Pro Fast and efficient
You can have multiple tabs open with multiple languages in at the same time and Code Runner still performs excellently. Searching through code is always instant and executing code is fast.
Pro Supports many different languages
Code Runner comes preinstalled with over 20 languages built in, and it's super easy to run simple programs.
Cons
Con Working with very very large projects
Code runner is fantastic for shorter projects, although it can handle very large projects. It stops code completion when the program gets to be several thousands of lines long.