By Avdi Grimm
For plenty of programmers, getting to know Ruby is a revelation. they're delighted via how elegantly and succinctly they could nation difficulties within the language. yet then the genuine international creeps in, and that pleasure steadily wanes because the code turns into cluttered with distracting area case eventualities, mistakes dealing with, and exams for nil.
Confident Ruby is a advisor to recapturing the enjoyment of writing Ruby via utilizing small styles and stylistic offerings to make every one technique inform a coherent tale. Over the process 32 styles, you’ll how you can isolate uncertainty on the borders of your code; how one can steer clear of repetitive conditionals; and the way to free up your code from the chore of nil-checking. You’ll observe the 4 components of a mode, and the way to exploit these components to build a story. Following besides real-world refactoring classes, you’ll easy methods to observe those classes to legacy code.
Whether you're a amateur or an skilled Ruby hacker, this ebook can assist you turn into a extra convinced and cheerful programmer.
Read or Download Confident Ruby: 32 Patterns for Joyful Coding PDF
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Additional resources for Confident Ruby: 32 Patterns for Joyful Coding
In order to do so, we just need to define the #to_int method on Place. new(:index, :name, :prize) do def to_int index end end Once we've made this change, we can use the Place objects as if they were integer array indices. winners[first] winners[second] winners[third] # => "Homestar" # => "King of Town" # => "Marzipan" The reason this works is that Ruby arrays use #to_int to convert the array index argument to an integer. Example: ConfigFile Here's another example. open takes a parameter, filename.
Org,456,2012-06-25 It's our task to write a method which handles imports of CSV data from the old system to the new system. We'll call the method #import_legacy_purchase_data. Here's what it needs to do: 1. Parse the purchase records from the CSV contained in a provided IO object. 1: Sending a strong message 2. For each purchase record, use the record's email address to get the associated customer record, or, if the email hasn't been seen before, create a new customer record in our system. 3. Use the legacy record's product ID to find or create a product record in our system.
From Roles to Objects To explain why this is, we need to go back to what we discussed in the previous chapter. There we talked about identifying the roles that a method will interact with. We saw that writing a method in terms of roles yielded code that told a clear and straightforward story. As we consider how to collect input for a method, we are thinking about how to map from the inputs that are available to the roles that the method would ideally interact with. com) Confident Ruby determining how lenient to be in accepting many types of input, and about whether to adapt the method's logic to suit the received collaborator types, or vice-versa.