sferik

warning: parser/current is loading parser/ruby33, which recognizes 3.3.0-dev-compliant syntax, but you are running 3.3.0.
Please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.
Mutant environment:
Matcher:         #<Mutant::Matcher::Config subjects: [X::MediaUploader]>
Integration:     minitest
Jobs:            10
Includes:        ["lib"]
Requires:        ["x", "x/media_uploader"]
Operators:       full
MutationTimeout: 10

sferik

require "option_parser"

class CountdownGame
  OPERATORS = [:+, :-, :*, :/]

  def initialize(@numbers : Array(Int32), @target : Int32)
  end

  def solve
    result = solve_recursively(@numbers.map { |n| {n, n.to_s} }).find { |result, _| result == @target }

sferik

require "http/client"
require "json"
require "oauth"

HOST = "api.twitter.com"
# Generate API keys at https://developer.twitter.com/en/portal/projects-and-apps
API_KEY = "Replace this with your Twitter API Key"
API_SECRET = "Replace this with your Twitter API Key Secret"
ACCESS_TOKEN = "Replace this with your Twitter Access Token"
ACCESS_TOKEN_SECRET = "Replace this with your Twitter Access Token Secret"

sferik

class SizeAwareCache
  @@cache = {} of String => Hash(Int32, String)

  def read(key : String, size : Int32)
    if value = @@cache.dig?(key, size)
      # Hit! (both key and size)
      return value
    elsif results = @@cache[key]?
      # Key hit, size miss
      sorted_results = results.to_a.sort_by(&.first)

sferik

require 'benchmark/ips'

def class_integer
  0.class == Integer
end

def version_gte
  RUBY_VERSION >= '2.4'
end

sferik

digraph G {
  label="Caddy Architecture"
  labelloc="top"
  fontsize=20
  fontname="Helvetica Neue"
  node [shape="ellipse", style="filled", fontname="Helvetica Neue"]
  edge [fontname="Helvetica Neue"]
  peripheries=0
  rankdir="LR"
  subgraph clusterClient {

sferik

module Enumerable
  def first_to_finish
    threads = collect { |args| Thread.new { yield(args) } }
    loop until done = threads.detect { |t| !t.alive? }
    threads.each(&:kill)
    done.value
  end
end

puts [5, 3, 1, 2, 4].first_to_finish { |x| sleep x }

sferik

What is the system Ruby?

What version of Ruby shipped by default on Mac OS X?

Default Ruby version * Refers to the fully patched version (e.g. 10.5.8, not 10.5.0). Earlier versions may have shipped with different Ruby patchlevels but the RUBY_VERSION has never changed within major Mac OS X releases.

Mac OS X version*	Mac OS X release date

sferik

require 'benchmark/ips'
require 'ostruct'

N = 100
ATTRS = (:aa..:zz).take(N)
HASH = Hash[ATTRS.map { |x| [x, x] }]

CStruct = Struct.new(*ATTRS)

def struct

sferik

def valid?(card_number)
  digits = card_number
             .split("")
             .map { |number| number.to_i }

  numbers = []
  digits.each_with_index do |digit, index|
    if index.even?
      numbers << digit * 2
    else