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

A translation table is a string containing one replacement letter for each of the 256 characters in the ASCII character set: >>> table = maketrans('cs', 'kz') >>> len(table) 256 >>> table[97:123] 'abkdefghijklmnopqrztuvwxyz' >>> maketrans('', '')[97:123] 'abcdefghijklmnopqrstuvwxyz' As you can see, I ve sliced out the part of the table that corresponds to the lowercase letters. Take a look at the alphabet in the table and that in the empty translation (which doesn t change anything). The empty translation has a normal alphabet, while in the preceding code, the letter c has been replaced by k, and s has been replaced by z.

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Similarly, you can use them to set multiple elements at the same time:

one with only the logo of your organization, another with three small icons, and a third with only a question mark.

[2, "a", "b", "c", 10, 12]

You can use ranges with objects belonging to many different classes, including ones you create yourself.

Among mainstream languages, symbols are reasonably unique to Ruby (although LISP and Erlang do have similar concepts). They re powerful and are used by most professional Ruby developers, so they re worth learning about, although they tend to confuse most new users. Let s jump straight into an illustrative example:

One of the most overlooked parts of the presentation experience is your introduction to the audience. A good introduction raises an audience s interest in the presentation and establishes your authority to give the talk in the rst place. To make sure that your story gets off to a solid start, plan the way you ll be introduced by inserting an optional Introductory slide directly after the Title slide. In Slide Sorter view, position the cursor to the right of the Title slide in the presentation, and on the Home tab of the Ribbon, in the Slides group, click New Slide, and then select Blank on the drop-down menu.

Once you have this table, you can use it as an argument to the translate method, thereby translating your string: >>> 'this is an incredible test'.translate(table) 'thiz iz an inkredible tezt'

current_situation = :good puts "Everything is fine" if current_situation == :good puts "PANIC!" if current_situation == :bad

In this example, :good and :bad are symbols. Symbols don t contain values or objects, like variables do. Instead, they re used as a consistent name within code. For example, in the preceding code you could easily replace the symbols with strings, like so:

7

current_situation = "good" puts "Everything is fine" if current_situation == "good" puts "PANIC!" if current_situation == "bad"

An optional second argument can be supplied to translate, specifying letters that should be deleted. If you wanted to emulate a really fast-talking German, for instance, you could delete all the spaces: >>> 'this is an incredible test'.translate(table, ' ') 'thizizaninkredibletezt'

This gives the same result, but isn t as efficient. In this example, every mention of good and bad creates a new object stored separately in memory, whereas symbols are single reference values that are only initialized once. In the first code example, only :good and :bad exist, whereas in the second example you end up with the full strings of "good", "good", and "bad" taking up memory. Symbols also result in cleaner code in many situations. Often you ll use symbols to give method parameters a name. Having varying data as strings and fixed information as symbols results in easier-to-read code. You might want to consider symbols to be literal constants that have no value, but whose name is the most important factor. If you assign the :good symbol to a variable, and compare that variable with :good in future, you ll get a match. This makes symbols useful in situations where you don t necessarily want to store an actual value, but a concept or an option. Symbols are particularly useful when creating hashes and you want to have a distinction between keys and values. For example: