Ruby code explainers

ruby

class ThreadSafeCounter
  def initialize(initial = 0)
    @count = initial
    @mutex = Mutex.new

A thread-safe counter with Mutex in Ruby

concurrency mutex thread-safety

Intermediate 6 steps

ruby

# Binary search using Ruby's built-in Array#bsearch.
#
# There are two modes:
#   1. find-minimum mode  -> block returns true/false (monotonic)

Binary search patterns with Ruby's bsearch

binary-search algorithms ranges

Intermediate 7 steps

ruby

class LinkedList
  include Enumerable
 
  Node = Struct.new(:value, :next_node)

Building an enumerable linked list in Ruby

linked-list enumerable data-structures

Intermediate 7 steps

ruby

module FileResource
  # Opens a file, yields it to the caller, and guarantees the
  # handle is closed even if the block raises an exception.
  def self.open(path, mode = "r")

Guaranteeing cleanup with begin/ensure in Ruby

resource-management exception-safety blocks

Intermediate 8 steps