Class: Object

Inherits:
BasicObject
Extended by:
Hoodie::Konstruktor
Defined in:
lib/hoodie/core_ext/try.rb,
lib/hoodie/core_ext/blank.rb,
lib/hoodie/utils/konstruktor.rb

Overview

Add #blank? and #present? methods to Object class.

Instance Method Summary collapse

Methods included from Hoodie::Konstruktor

takes

Instance Method Details

#blank? ⇒ Boolean

Returns true if the object is nil or empty (if applicable)

[].blank?         #=>  true
[1].blank?        #=>  false
[nil].blank?      #=>  false

Returns:

  • (Boolean) 


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# File 'lib/hoodie/core_ext/blank.rb', line 30

def blank?
  nil? || (respond_to?(:empty?) && empty?)
end

#present? ⇒ Boolean

Returns true if the object is NOT nil or empty

[].present?         #=>  false
[1].present?        #=>  true
[nil].present?      #=>  true

Returns:

  • (Boolean) 


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# File 'lib/hoodie/core_ext/blank.rb', line 42

def present?
  !blank?
end

#try(*a, &b) ⇒ Object

Note:

try is defined on Object. Therefore, it won’t work with instances

Invokes the public method whose name goes as first argument just like public_send does, except that if the receiver does not respond to it the call returns nil rather than raising an exception.

of classes that do not have Object among their ancestors, like direct subclasses of BasicObject.

Parameters:

  • object (String)
  • method (Symbol) 


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# File 'lib/hoodie/core_ext/try.rb', line 35

def try(*a, &b)
  try!(*a, &b) if a.empty? || respond_to?(a.first)
end

#try!(*a, &b) ⇒ Object

Same as #try, but will raise a NoMethodError exception if the receiver is not nil and does not implement the tried method.

Raises:

  • NoMethodError If the receiver is not nil and does not implement the tried method.



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# File 'lib/hoodie/core_ext/try.rb', line 45

def try!(*a, &b)
  if a.empty? && block_given?
    if b.arity.zero?
      instance_eval(&b)
    else
      yield self
    end
  else
    public_send(*a, &b)
  end
end