NOTES.md

Notes

More Bool / Boolean Gems / Libraries

Search rubygems with bool / boolean :-).

• gem to_bool, source https://github.com/bricker/to_bool
• gem wannabe_bool, source https://github.com/prodis/wannabe_bool
• gem boolean, source https://github.com/RISCfuture/boolean - archived (read-only)
• gem boolean_class, source https://github.com/elgalu/boolean_class
• gem to_boolean, source https://github.com/JaniJegoroff/to_boolean
• ...

• https://github.com/janlelis/boolean2

Articles

• https://www.rubytapas.com/2019/01/08/boolean/ Why Ruby doesn't have a Boolean class by Avdi Grimm, January 2019
• https://api.rubyonrails.org/classes/ActiveModel/Type/Boolean.html
• https://stackoverflow.com/questions/3028243/check-if-ruby-object-is-a-boolean
• https://en.wikipedia.org/wiki/Boolean_data_type

Discuss

• Add Built-in Float Number Conversion Too - Why? why not?

0.0.to_b      #=> false
1.0.to_b      #=> true
0.1.to_b      #=> true
-0.1.to_b     #=> true
-1.0.to_b     #=> true

0.0.to_bool   #=> false
1.0.to_bool   #=> true

0.1.to_bool   #=> nil
-0.1.to_bool  #=> nil
-1.0.to_bool  #=> nil

• Make an empty string a valid false value e.g. "".to_bool() == false or "".to_bool() == nil - why? why not?
  • ruby on rails ActiveModel bool type - returns nil for empty string (and not false)

More / Misc(ellaneous)

class String
  def to_bool
    return true if self =~ (/^(true|t|yes|y|1)$/i)
    return false if self.empty? || self =~ (/^(false|f|no|n|0)$/i)

    raise ArgumentError.new "invalid value: #{self}"
  end
end

Source: https://zaiste.net/string_to_boolean_in_ruby/

def Boolean(value)
    case value
    when true, 'true', 1, '1', 't' then true
    when false, 'false', nil, '', 0, '0', 'f' then false
    else
      raise ArgumentError, "invalid value for Boolean(): \"#{value.inspect}\""
    end
  end

Source: https://coderwall.com/p/inziba/conversion-to-boolean-in-ruby

def Boolean(b)
  return b if b.nil? || b == true || b == false
  case b
  when /^1$/, /^true$/i , /^yes$/i then true
  when /^0$/, /^false$/i , /^no$/i then false
  else
    raise ArgumentError, "Unknown conversion to boolean type from: #{b.class}, Inspect: #{b.inspect}"
  end
end

Source: https://rubygems.org/gems/global_boolean

def Boolean(val)
    return true if val.kind_of?(TrueClass)
    return false if val.kind_of?(FalseClass)

    if val.kind_of?(String)
      down = val.downcase
      return !!/1|true|t|yes|y/.match(down)
    end

    if val.kind_of?(Integer) || val.kind_of?(Float)
      return val != 0
    end

    false
  end

Source: https://rubygems.org/gems/be_boolean