Ruby Cold CutsPart II

Enumerating Enumerable

INTO DARKNESS

Review

• Idiomatic Ruby for Iterating / Looping

• Part of the Ruby Core

• Written in C (very fast)

• Includes many methods to help in development

• Is a module

Enumerable

Modules• Composition

• Built into the Ancestor Tree

• Methods defined in module are available to classes

More Enumerable

#inject

#inject

#inject

#inject

#inject

#grep

#take_while

HashArray

Set

Implementing Enumerable

• Include Enumerable

• Define Each

• Yield or Delegate

• Optionally Define <=>

Internal Iterator

Self Iterator

Demo

Thank You