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This sample show how to attach globally to events over dynamically created elements. And how can data-* attributes be used to customize behaviour.

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def ej(a, b)
  size = [a.size, b.size].min
  a[0...size].zip(b[0...size])
    .map { |e| e.max }
    .map(&.+(4))
    .select(&.>=(10))
    .sum
end

ej [1,5,3,4], [5,3,6]

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data = [{"Brian", 42}, {"Alan", 30}, {"Brian", 32}]

# unstable
data.sort_by &.[0]  # => [{"Brian", 42}, {"Alan", 30}, {"Brian", 32}]

# stable
data.map_with_index { |d,i| {d,i} }.sort_by { |di| {di[0][0], di[1]} }.map { |di| di[0] } # => [{"Alan", 30}, {"Brian", 42}, {"Brian", 32}]

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require "benchmark"

def string_contains_word(source, word)
  return false unless source
  start = source.index(word)
  return false unless start
  return false if start > 0 && source[start-1].alphanumeric?
  return false if start + word.size < source.size && source[start + word.size].alphanumeric?
  true
end

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puts "sfs"
class Crystal::Playground::Agent
  def sendp(t)
    send(t)
  end
end

# $p.try &.sendp("bug")
10.times do |i|
  puts i

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puts "sfs"

10.times do |i|
  puts i
  { "Lon\nrem", i, i + 1 }
  sleep 1
end

sleep 2

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clearscreen
rt 30
repeat 3 [ 
  rt 30
  fd 172
  bk 172
  lt 30
  
  fd 200 
  rt 120 

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# sample of a macro that flood the method calls with `#try`
# as a POC it does not support methods with arguments
macro mtry(expr)
  {% if expr.is_a?(Call) %}
    mtry({{expr.receiver}}).try(&.{{expr.name}})
  {% else %}
    {{expr}}
  {% end %}
end

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A Pen by Brian J. Cardiff on CodePen.

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INTRODUCTION TO PROGRAMMING FOR THE VISUAL ARTS WITH P5.JS

Assignment 1: Port an Image to Code