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Namespaces 101

Introduction

Ruby has recently merged namespaces as an experimental feature that is disabled by default, as of this writing.

This is a non-trivial development driven by @matz himself, and mainly implemented by @tagomoris, who just became a Ruby committer (🎉).

The feature has been cooking for a long time, with a first ticket opened a couple of years ago (#19744) and a revised one opened just last week (#21311).

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import iterm2
import sys

async def main(connection):
    app = await iterm2.async_get_app(connection)
    session = app.current_terminal_window.current_tab.current_session
    change = iterm2.LocalWriteOnlyProfile()
    change.set_background_image_location("")
    await session.async_set_profile_properties(change)

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Ruby: The future of frozen string literals

What is a literal?

In programming languages, literals are textual representations of values in the source code. This is a syntactical concept.

Some examples:

7 # integer literal

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# crystal build foo.cr --release
# ./foo 37.7749 -122.4194 34.0522 -118.2437
#
# Around 0.08s.

module GeoCalculator
  EARTH_RADIUS_IN_KM = 6371.0

  def self.distance(lat1, lon1, lat2, lon2)
    dlat = lat2 - lat1

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docker run \
  -d \
  --name=mysql-test-truncation \
  -e MYSQL_ROOT_PASSWORD=root \
  -e MYSQL_ROOT_HOST=% \
  -p 3307:3306 \
  mysql/mysql-server:latest

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threads = []

5.times do
  threads << Thread.new {
    p require 'date'
  }
end

threads.each(&:join)

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autoload :Date, 'date'

module Kernel
  alias_method :original_require, :require

  def require(path)
    puts "Require invoked for #{path}"

    original_require(path).tap do |loaded|
      if loaded

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require 'find'
require 'ptools'

frequencies = Hash.new(0)

Find.find('.') do |path|
  basename = File.basename(path)

  if basename.start_with?('.')
    Find.prune if basename == '.git'

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import std/[os,setutils]

const
  markerLen = 4

let datastream = readFile(paramStr(1))

for i in 0 .. (high(datastream) - markerLen):
  let chunk = datastream[i ..< i + markerLen]
  if chunk.toSet.card == markerLen:

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import std/[os,sequtils,strutils]

type
  Assingment = tuple[fromSection, toSection: uint]

func toAssingment(rangeStr: string): Assingment =
  let pair = rangeStr.split('-')
  result.fromSection = parseUInt(pair[0])
  result.toSection = parseUInt(pair[1])