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As discussed in 3, you have a number of options when it comes to laying out your Silverlight application. Although these layout controls can be added manually, Expression Blend 2 offers a visual option. In this section we will look at how Expression Blend can be used to easily work with the Grid layout control.

Here s a basic array: x = [1, 2, 3, 4] This array has four elements. Each element is an integer, and is separated by commas from its neighboring elements. Square brackets are used to denote an array literal. Elements can be accessed by their index (their position within the array). To access a particular element, an array (or a variable containing an array) is followed by the index contained within square brackets. This is called an element reference. For example: x = [1, 2, 3, 4] puts x[2]

3 As with most programming languages, the indexing for Ruby s arrays starts from 0, so the first element of the array is element 0, and the second element of the array is element 1, and so on. In our example, this means x[2] is addressing what we d call the third element of the array, which in this case is an object representing the number 3. To change an element, you can simply assign it a new value or manipulate it as you ve manipulated numbers and strings earlier in this chapter: x[2] += 1 puts x[2]

4 Or: x[2] = "Fish" * 3 puts x[2]

In Expression Blend, you place dividers to create columns and rows in the grid. When a Grid control is defined, Expression Blend will show blue rulers above and to the left of the grid. When you move your cursor over the blue rulers, a row divider will appear. Clicking the blue ruler will place the divider, and dragging a placed divider will move it. You will have a chance to try this out in a moment. In the top-left corner of the window is an icon that determines the grid s edit mode. There are two layout editing modes for a grid within Expression Blend: Canvas layout mode: In canvas layout mode, when column and row dividers are moved, elements inside those rows and columns stay in place. Grid layout mode: In grid layout mode, the elements move with the column and row dividers.

Drive the crankshaft 8 intake, 8 exhaust One for each wheel One for each wheel One for each wheel Carpeting and Mats

FishFishFish Arrays don t need to be set up with predefined entries or have elements allocated manually. You can create an empty array like so: x = []

C ha p ter 3 r U B Y S B U ILDI NG B LO C K S : D a t a , e X p r e S S I O N S , a N D F LO W C O N t r O L

The array is empty, and trying to address, say, x[5] results in nil being returned. You can add things to the end of the array by pushing data into it, like so: x = [] x << "Word" After this, the array contains a single element: a string saying "Word". With arrays, << is the operator for pushing an item onto the end of an array. You can also use the push method, which is equivalent: x.push("Word") You can also remove entries from an array one by one. Traditionally, arrays act as a last in, first out system where items can be pushed onto the end but also popped from the end (popping is the process of retrieving and removing items from the end of the array). x = [] x << "Word" x << "Play" x << "Fun" puts x.pop puts x.pop puts x.length