By Jay McGavren
ISBN-10: 1449372651
ISBN-13: 9781449372651
Head First Ruby makes use of an enticing, lively method of studying that is going past dry, summary reasons and reference manuals. This Head First advisor teaches you the Ruby language in a concrete approach that will get your neurons zapping and is helping you develop into a Ruby rock famous person. you will input at Ruby's language fundamentals and paintings via gradually complicated Ruby positive factors corresponding to blocks, gadgets, tools, periods, and average expressions. As your Ruby abilities develop, you are going to take on deep themes similar to exception dealing with, modules, mixins, and metaprogramming.
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Additional info for Head First Ruby
Example text
Your Ruby Toolbox You舗ve got Chapter 1 under your belt and now you舗ve added method calls, conditionals, and loops to your tool box. Statements Conditional statements execute the code they enclose if a condition is met. Loops execute the code they enclose repeatedly. They exit when a condition is met. BULLET POINTS Ruby is an interpreted language. You don舗t have to compile Ruby code before executing it. You don舗t need to declare variables before assigning to them. You also don舗t have to specify a type.
The opposite of 舠if舡 is 舠unless舡 This statement works, but it舗s a little awkward to read: if not guessed_it ŠŠputs "Sorry. You didn't get my number. )" end In most respects, Ruby舗s conditional statements are just like most other languages. Ruby has an additional keyword, though: unless. Code within an if statement executes only if a condition is true, but code within an unless statement executes only if the condition is false. " end The unless keyword is an example of how Ruby works hard to make your code a little easier to read.
A Ruby method can return a value to its caller using the return keyword. You can write a single mileage method, and use its return value in your output. def mileage(miles_driven, gas_used) ŠŠreturn miles_driven / gas_used end Then, you can use the same method to calculate both types of mileage. Implicit return values You don舗t actually need the return keyword in the above method. The value of the last expression evaluated within a method automatically becomes that method舗s return value. So, our mileage method could be rewritten without an explicit return: def mileage(miles_driven, gas_used) ŠŠmiles_driven / gas_used end It will still work in exactly the same way.
Head First Ruby by Jay McGavren
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