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Journaling is a practice that we suggest adding to your XP toolkit. It is the other practice that we added to the standard 12. Every day, you should spend about 15 minutes or so writing down what happened that day. This can be your thoughts, observations, or just general notes as to the day s progress. The idea is to write about whatever is on your mind that day. Journaling can be an effective tool for finding positive and negative patterns within the XP team. You can use this information as a lessons-learned type tool. Also, journaling can be a way to collect your thoughts so you can communicate more effectively. You might even find it humorous when you review your journal after the project is over. By now, you should start to see that the practices are very interdependent. Figure 1-1 shows that interdependency. Removing one or more practices will have a negative impact on the remaining practices. For example, if you choose not to practice test-first development, you will impact collective code ownership because the developers will not have the confidence that the tests would have given them when they change code.

As it is a value, it could be returned as the result of a function, passed to another function, or bound to an identifier. This provides a very concise way to define the add function: let add = (+) You ll see how using an operator as a value can be useful later in this chapter when we look at working with lists. Users can define their own operators or redefine any of the existing ones if they want (although this is not always advisable, because the operators then no longer support overloading). Consider the following perverse example that redefines + to perform subtraction: let (+) a b = a - b printfn "%i" (1 + 1) User-defined (custom) operators must be nonalphanumeric and can be a single character or a group of characters. You can use the following characters in custom operators: !$%&*+-./<=> @^|~ The syntax for defining an operator is the same as using the let keyword to define a function, except the operator replaces the function name and is surrounded by parentheses so the compiler knows that the symbols are used as a name of an operator, rather than as the operator itself. The following example shows defining a custom operator, +*, which adds its operands and then multiplies them: let ( +* ) a b = (a + b) * a * b printfn "(1 +* 2) = %i" (1 +* 2) The results of this example, when compiled and executed, are as follows: (1 +* 2) = 6 Unary operators always come before the operand. User-defined binary operators are prefix if they start with an exclamation mark (!), a question mark ( ), or a tilde (~); they are infix, with operators coming between the operands, for everything else.

background = pygame.image.load(background_image_filename).convert() sprite = pygame.image.load(sprite_image_filename).convert_alpha() clock = pygame.time.Clock() sprite_pos = Vector2(200, 150) sprite_speed = 300. while True: for event in pygame.event.get(): if event.type == QUIT: exit() pressed_keys = pygame.key.get_pressed() key_direction = Vector2(0, 0) if pressed_keys[K_LEFT]: key_direction.x = 1 elif pressed_keys[K_RIGHT]: key_direction.x = +1 if pressed_keys[K_UP]: key_direction.y = -1 elif pressed_keys[K_DOWN]: key_direction.y = +1 key_direction.normalize() screen.blit(background, (0,0)) screen.blit(sprite, sprite_pos) time_passed = clock.tick(30) time_passed_seconds = time_passed / 1000.0 sprite_pos += key_direction * sprite_speed * time_passed_seconds pygame.display.update() Listing 6-2 cheats a little in calculating the direction vector. It sets the x component to 1 or +1 if K_LEFT or K_RIGHT is pressed and the y component to 1 or +1 if K_UP or K_DOWN is pressed. This gives us the same result as adding two of the simple horizontal and vertical heading vectors together. If you ever see a mathematical shortcut that lets you do something with less code, feel free to try it out game developers find that they accumulate many such time-saving gems!

Function application, also sometimes referred to as function composition or composing functions, simply means calling a function with some arguments. The following example shows the function add being defined and then applied to two arguments. Notice that the arguments are not separated with parentheses or commas; only whitespace is needed to separate them. let add x y = x + y let result = add 4 5 printfn "(add 4 5) = %i" result