Download Confident Ruby (for james tumino) by Avdi Grimm PDF

By Avdi Grimm

Show description

Read Online or Download Confident Ruby (for james tumino) PDF

Best nonfiction_12 books

Critical Phenomena in Loop Models

While just about a continuing part transition, many actual structures can usefully be mapped to ensembles of fluctuating loops, which would characterize for instance polymer earrings, or line defects in a lattice magnet, or worldlines of quantum debris. 'Loop types' offer a unifying geometric language for difficulties of this sort.

Extra resources for Confident Ruby (for james tumino)

Sample text

Open. gitconfig> Why does this work? Let's take a look at the code. c: CONST_ID(to_path, "to_path"); tmp = rb_check_funcall(obj, to_path, 0, 0); if (tmp == Qundef) { tmp = obj; } StringValue(tmp); This code says, in effect: "see if the passed object responds to #to_path. If it does, use the result of calling that method. Otherwise, use the original object. to_str end Conditionally calling conversion methods is a great way to provide flexibility to client code: code can either supply the expected type, or pass something which responds to a documented conversion method.

Id}" Talk like a duck If you've been programming in Ruby for any length of time all this talk of roles is probably ringing a bell. Roles are names for duck types, simple interfaces that are not tied to any specific class and which are implemented by any object which responds to the right set of messages. Despite the prevalance of duck-typing in Ruby code, there are two pitfalls that users of duck-types often fall into. First, they fail to take the time to determine the kind of duck they really need.

Programming in short, clear, intent-revealing stanzas. No tedious boilerplate; no cluttered thickets of syntax. The logic I saw in my head, transferred into program logic with a minimum of interference. But my programs grew, and as they grew, they started to change. The real world poked its ugly head in, in the form of failure modes and edge cases. Little by little, my code began to lose its beauty. Sections became overgrown with complicated nested if/then/else logic and && conditionals. Objects stopped feeling like entities accepting messages, and started to feel more like big bags of attributes.

Download PDF sample

Rated 4.75 of 5 – based on 36 votes