Method: Hanami::Utils::Kernel.String

Defined in:

lib/hanami/utils/kernel.rb

.String(arg) ⇒ String

Coerces the argument to be a String.

Identical behavior of Ruby’s Kernel.Array, still here because we want to keep the interface consistent

Examples:

Basic Usage

require 'date'
require 'bigdecimal'
require 'hanami/utils/kernel'

Hanami::Utils::Kernel.String('')                            # => ""
Hanami::Utils::Kernel.String('ciao')                        # => "ciao"

Hanami::Utils::Kernel.String(true)                          # => "true"
Hanami::Utils::Kernel.String(false)                         # => "false"

Hanami::Utils::Kernel.String(:hanami)                        # => "hanami"

Hanami::Utils::Kernel.String(Picture)                       # => "Picture" # class
Hanami::Utils::Kernel.String(Hanami)                         # => "Hanami" # module

Hanami::Utils::Kernel.String([])                            # => "[]"
Hanami::Utils::Kernel.String([1,2,3])                       # => "[1, 2, 3]"
Hanami::Utils::Kernel.String(%w[a b c])                     # => "[\"a\", \"b\", \"c\"]"

Hanami::Utils::Kernel.String({})                            # => "{}"
Hanami::Utils::Kernel.String({a: 1, 'b' => 'c'})            # => "{:a=>1, \"b\"=>\"c\"}"

Hanami::Utils::Kernel.String(Date.today)                    # => "2014-04-11"
Hanami::Utils::Kernel.String(DateTime.now)                  # => "2014-04-11T10:15:06+02:00"
Hanami::Utils::Kernel.String(Time.now)                      # => "2014-04-11 10:15:53 +0200"

Hanami::Utils::Kernel.String(1)                             # => "1"
Hanami::Utils::Kernel.String(3.14)                          # => "3.14"
Hanami::Utils::Kernel.String(013)                           # => "11"
Hanami::Utils::Kernel.String(0xc0ff33)                      # => "12648243"

Hanami::Utils::Kernel.String(Rational(-22))                 # => "-22/1"
Hanami::Utils::Kernel.String(Complex(11, 2))                # => "11+2i"
Hanami::Utils::Kernel.String(BigDecimal(7944.2343, 10))     # => "0.79442343E4"
Hanami::Utils::Kernel.String(BigDecimal('Infinity'))        # => "Infinity"
Hanami::Utils::Kernel.String(BigDecimal('NaN'))             # => "Infinity"

String interface

require 'hanami/utils/kernel'

SimpleObject = Class.new(BasicObject) do
  def to_s
    'simple object'
  end
end

Isbn = Struct.new(:code) do
  def to_str
    code.to_s
  end
end

simple = SimpleObject.new
isbn   = Isbn.new(123)

Hanami::Utils::Kernel.String(simple) # => "simple object"
Hanami::Utils::Kernel.String(isbn)   # => "123"

Comparison with Ruby

require 'hanami/utils/kernel'

# nil
Kernel.String(nil)               # => ""
Hanami::Utils::Kernel.String(nil) # => ""

Unchecked Exceptions

require 'hanami/utils/kernel'

# Missing #to_s or #to_str
input = BaseObject.new
Hanami::Utils::Kernel.String(input) # => TypeError

Parameters:

• arg (Object) —

  the argument

Returns:

• (String) —

  the result of the coercion

Raises:

• (TypeError) —

  if the argument can’t be coerced

See Also:

• http://www.ruby-doc.org/core/Kernel.html#method-i-String

Since:

• 0.1.1

# File 'lib/hanami/utils/kernel.rb', line 655

def self.String(arg)
  arg = arg.to_str if arg.respond_to?(:to_str)
  super
rescue NoMethodError
  raise TypeError.new "can't convert #{inspect_type_error(arg)}into String"
end