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Ruby Blocks

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Implementing Block Methods

3:30 with Jason Seifer

Blocks are easy to use in our classes. In this video, we'll practice writing a class that mimics arrays.

Code Samples

class MyArray
  attr_reader :array
  def initialize
    @array = []
  end

  def push(item)
    array.push(item)
  end

  def each(&block)
    i = 0
    while i < array.length
      block.call(array[i])
      i += 1
    end
    array
  end
end

my_array = MyArray.new
my_array.push(1)
my_array.push(2)
my_array.push(3)

my_array.each{ |item| puts "item: #{item}" }

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    Okay. So the next thing that we're gonna do 0:00
    is take a look at a built in method by re-implementing it. 0:00
    And what we're gonna do 0:04
    is create a new class that functions kind of like an array. 0:06
    We're gonna call it my_array.rb. 0:10
    So this is going to need to be a class, MyArray. 0:13
    So we'll define the class, 0:18
    and we'll have the initialize method, and for 0:23
    right now we're going to use the built in array. 0:27

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