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1. A Guide to GC.stat A Guide to GC.stat

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   Most Ruby programmers don't have any idea how garbage collection works in their runtime - what triggers it, how often it runs, and what is garbage collected and what isn't. That's not entirely a bad thing - garbage collection in dynamic languages like Ruby is usually pretty complex, and Ruby programmers are better off just focusing on writing code that matters for their users. 

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   But, occasionally, you get bitten by GC - either it's running too often or not enough, or your process is using tons of memory but you don't know why. Or maybe you're just curious about how GC works! 

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   One way we can learn a bit about garbage collection in CRuby (that is, the standard Ruby runtime, written in C) is to look at the built-in `GC` module. If you haven't [read the docs](https://ruby-doc.org/core-2.4.0/GC.html) of this module, check it out. There's a lot of interesting methods in there. But for right now, we're just going to look at one: `GC.stat`. 

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