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A loop is a way of running through a piece of code more than once. Loops are pretty fundamental in programming languages, and you will find that almost every line of code you write in a game is inside some kind of loop. Like many other programming languages, Python has two types of loop to handle all your looping needs: the while loop and the for loop. While Loops A while loop is used when you repeat a piece of code only when a condition is true. Let s use a simple while loop to display the numbers from 1 to 5. We ll start by entering the following lines in the interpreter: >>> count=1 >>> while count<=5: ... When you hit Enter after the second line, you will notice that instead of the usual Python prompt you now see three periods (...). This is because the colon at the end of the line indicates that there is more code to follow. In the case of a while loop, it is the code that we want to be repeated. All languages need some way to mark the beginning and end of code blocks. Some use symbols like curly braces ({ }), and others use words like do and end. Python does things slightly differently and uses indentation to define blocks. To tell Python that a line of code is part of the block and not the rest of the code, insert a tab before the line (by pressing the Tab key): ... ... print count count+=1

In 3, I talked about how you could bind identifiers to values using the keyword let and noted how, under some circumstances, you could redefine and rebound, but not modify, these identifiers. If you want to define an identifier whose value can change over time, you can do this using the mutable keyword. A special operator, the left ASCII arrow (or just left arrow), is composed of a less-than sign and a dash (<-), you use it to update these identifiers. An update operation using the left arrow has type unit, so you can chain these operations together as discussed in the previous section. The next example demonstrates how to define a mutable identifier of type string and then change the value that it holds: // a mutable idendifier let mutable phrase = "How can I be sure, " // print the phrase printfn "%s" phrase // update the phrase phrase <- "In a world that's constantly changing" // reprint the phrase printfn "%s" phrase The results are as follows: How can I be sure, In a world that's constantly changing At first glance this doesn t look too different from redefining an identifier, but it has a couple of key differences. When you use the left arrow to update a mutable identifier, you can change its value but not its type when you redefine an identifier, you can do both. A compile error is produced if you try to change the type, as this example demonstrates: let mutable number = "one" phrase <- 1 If you attempt to compile this code, you get the following error message: Prog.fs(9,10): error: FS0001: This expression has type int but is here used with type string

Private and protected instance field Public instance field Private and protected class field Public class field Static final

Note On some systems you may find that a tab is automatically inserted on the first line of a block. This

The other major difference is where these changes are visible. When you redefine an identifier, the change is visible only within the scope of the new identifier. When it passes out of scope, it reverts to its old value. This is not the case with mutable identifiers. Any changes are permanent, whatever the scope, as this example demonstrates: // demonstration of redefining X let redefineX() = let x = "One" printfn "Redefining:\r\nx = %s" x if true then let x = "Two" printfn "x = %s" x printfn "x = %s" x // demonstration of mutating X let mutableX() = let mutable x = "One" printfn "Mutating:\r\nx = %s" x if true then x <- "Two" printfn "x = %s" x printfn "x = %s" x // run the demos redefineX() mutableX() Executing the preceding code produces the following results: Redefining: x = One x = Two x = One Mutating: x = One x = Two x = Two Identifiers defined as mutable are somewhat limited because you can t use them within a subfunction, as this example illustrates: let mutableY() = let mutable y = "One" printfn "Mutating:\r\nx = %s" y