ASP.NET PDF Viewer using C#, VB/NET

>>> "foo" == "foo" True >>> "foo" == "bar" False Double Why can t you just use a single equality sign, like they do in mathematics I m sure you re clever enough to figure this out for yourself, but let s try it: >>> "foo" = "foo" SyntaxError: can't assign to literal The single equality sign is the assignment operator, which is used to change things, which is not what you want to do when you compare things. is: The Identity Operator The is operator is interesting. It seems to work just like ==, but it doesn t: >>> x >>> z >>> x True >>> x True >>> x True >>> x False = y = [1, 2, 3] = [1, 2, 3] == y == z is y is z

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The each iterator gives you a lot of power, as it allows you to go through all the elements of an array or a hash and use the data you retrieve to work out, for example, the mean average of an array of numbers, or the length of the longest string in an array, like so:

my_array = %w{this is a test of the longest word check} longest_word = '' my_array.each do |word| longest_word = word if longest_word.length < word.length end puts longest_word

Now that you have a range of techniques in mind, start sketching the rest of your storyboard. Sketch each and every slide in the entire storyboard rst, even if you already have some nished graphics that you know you want to use that way you don t get caught up in the visual details of individual slides that prevent you from spending time on the rest of the slides. After you have a sketch for every slide in place, you ll review the entire storyboard in Slide Sorter view in 8 to assess how much time you have to add graphics, where you need to spend your time rst, what resources you have to get things done, and who you can ask for help if you need it. This process might seem challenging now, but the more you storyboard, the more skilled you ll become. Just as you do when you write the story template, it helps to bring in other people to collaborate with you on the storyboard. If you re using a Tablet PC, you can project the storyboard on a screen and sketch together; if you re using paper, you can tape printed copies of individual slides on the wall and collaborate that way. And just as you do when you verbally edit the story template, look for ways to visually edit, tighten, and improve your storyboard. When you have a fully sketched storyboard in hand, it s time to turn the sketches into nished graphics as you complete your nal PowerPoint storyboard in the next chapter.

In this case, you loop through my_array, and if the currently stored longest word is shorter than the length of word, you assign it to longest_word. When the loop finishes, the longest word is in longest_word. The same code could be tweaked to find the largest (or smallest) number in a set of numbers:

Until the last example, this looks fine, but then you get that strange result, that x is not z even though they are equal. Why Because is tests for identity, rather than equality. The variables x and y have been bound to the same list, while z is simply bound to another list that happens to contain the same values in the same order. They may be equal, but they aren t the same object. Does that seem unreasonable Consider this example: >>> x = [1, 2, 3] >>> y = [2, 4] >>> x is not y True >>> del x[2] >>> y[1] = 1 >>> y.reverse() In this example, I start with two different lists, x and y. As you can see, x is not y (just the inverse of x is y), which you already know. I change the lists around a bit, and though they are now equal, they are still two separate lists: >>> x == y True >>> x is y True

my_array = %w{10 56 92 3 49 588 18} highest_number = 0 my_array.each do |number| number = number.to_i highest_number = number if number > highest_number end puts highest_number

IN THIS CHAPTER, YOU WILL: