Black Bytes » Jesus Castello

My New Favorite Enumerable Method

Jesus Castello — Mon, 07 Mar 2016 17:15:33 +0000

Enumerable is an amazing module, and it’s a big part of what makes Ruby such a great programming language. Enumerable gives you all sorts of cool methods like map, select and inject. But my new favorite is each_cons. This method is really useful, you can use it to find n-grams or to check if a […]

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Exploring MRI Source Code

Jesus Castello — Tue, 16 Feb 2016 21:39:56 +0000

If you have been using Ruby for a while you are probably curious about how some things work under the hood. One way to dig deep into Ruby internals is by reading the source code that makes it work. Even if you don’t know C, you can still pick up some interesting things. A great […]

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The Ultimate Guide to Blocks, Procs & Lambdas

Jesus Castello — Tue, 02 Feb 2016 18:26:17 +0000

Understanding Blocks Blocks are very prevalent in Ruby, you can think of them as little anonymous functions that can be passed into methods. Blocks are enclosed in a do / end statement or between brackets {}, and they can have multiple arguments. The argument names are defined between two pipe | characters. If you have […]

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11 Ruby Tricks You Haven’t Seen Before

Jesus Castello — Mon, 18 Jan 2016 20:40:35 +0000

1. Deep copy When you copy an object that contains other objects, like an Array, only a reference to these objects is copied. You can see that in action here: [crayon-56ed73b33a5cb609966278/] Using the Marshal class, which is normally used for serialization, you can create a ‘deep copy’ of an object. [crayon-56ed73b33a5e0764427572/] The results: [crayon-56ed73b33a5ea490133184/] 2. […]

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Understanding Mutable Objects & Frozen Strings

Jesus Castello — Sun, 03 Jan 2016 18:32:22 +0000

Let’s talk about mutability. What does it mean for an object to be mutable? Don’t let the fancy word deceive you, it just means that the object state can be changed. Not all objects in Ruby are mutable, for example, it doesn’t make any sense for numbers or symbols, or even true or false (which […]

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