aarongough

if( object.property )
  {
  var result = object.property;
  }
else
  {
  var result = object.otherProperty;
  }

aarongough

var result = (object.property) ? object.property : object.otherProperty;

aarongough

var result = object.property || object.otherProperty;

aarongough

window.firstProperty = "Hello!";
window.secondProperty = "I'm number 2!";

var result = window.firstProperty || window.secondProperty;

alert( result ); // Hello!

aarongough

// window.firstProperty === undefined;
window.secondProperty = "I'm number 2!";

var result = window.firstProperty || window.secondProperty;

alert( result ); // I'm number 2!

aarongough

var viewportHeight = self.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
//                    ^ FF, Safari, Opera             ^ IE6 Strict                  ^ All other explorers

aarongough

require 'test/unit'

class SanityTest < Test::Unit::TestCase
  def test_my_sanity
    complex_array = [{:blah => "hello"},{:foo => "blah"}]
    copied_array = complex_array
    copied_array[0][:blah] = nil
    
    assert_not_equal copied_array, complex_array
  end

aarongough

require 'test/unit'

class SanityTest < Test::Unit::TestCase
  def test_my_sanity
    complex_array = [{:blah => "hello"},{:foo => "blah"}]
    copied_array = complex_array.clone
    copied_array[0][:blah] = nil
    
    assert_not_equal copied_array, complex_array
  end

aarongough

require 'test/unit'

class ShallowTest < Test::Unit::TestCase
  def test_standard_copy_should_be_by_reference_and_changes_should_back_propagate
    simple_array = [1,"hello", 3.000]
    copied_array = simple_array
    copied_array[0] = nil
    copied_array[1] = nil
    copied_array[2] = nil
    

aarongough

require 'test/unit'

class FinallySaneTest < Test::Unit::TestCase
  def test_deep_copy
    complex_array = [{:blah => "hello"},{:foo => "blah"}]
    copied_array = Marshal.load(Marshal.dump(complex_array))
    copied_array[0][:blah] = nil
    
    assert_not_equal copied_array, complex_array
  end