Convenient IRB methods

#ruby

Below are a bunch of snippets to add to your IRB config for convenient scripting / personal use. But don't put this directly into any codebase, that will be a bad practice.

Set XOR

class Array
  # Returns the union of `array` and Array `other` minus elements in both.
  def ^(other)
    (self | other) - (self & other)
  end
end

Random

class Random
  # Return a random boolean value.
  def self.bool
    [true, false].sample
  end

  # Returns a random string containing `size` characters from `characters`.
  def self.string(size, characters = [*'a'..'z', *'A'..'Z', *'0'..'9'])
    Array.new(size) { characters.sample }.join
  end

  # Return a random boolean value.
  def bool
    self.rand(2).zero?
  end

  # Returns a random string containing `size` characters from `characters`.
  def string(size, characters = [*'a'..'z', *'A'..'Z', *'0'..'9'])
    Array.new(size) { characters[self.rand(characters.size)] }.join
  end
end

If you want to securely generate random strings, check out SecureRandom.

Clear

# Clear the terminal.
def clear
  print "\033c"
end

Null stream

$null = File.open(File::NULL, 'w')

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