Ruby Standard Library

Master Ruby's rich standard library. Ruby comes with powerful built-in classes and modules that handle common programming tasks elegantly.

Enumerable

The Enumerable module provides iteration methods for collections.

Common Enumerable Methods

numbers = [1, 2, 3, 4, 5]

# map/collect - Transform elements
numbers.map { |n| n * 2 }  # [2, 4, 6, 8, 10]
numbers.map(&:to_s)        # ["1", "2", "3", "4", "5"]