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Print Quick Response Code in Objective-C The Assembly Line: Creating Repeat Loops

CHAPTER
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The Assembly Line: Creating Repeat Loops
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he repeat loop is one of the two programming concepts that separate AppleScript from other automation solutions such as recording macros or running actions in Adobe Photoshop (the other one being conditional statements). This loop allows you to perform a single set of actions multiple times. Figure 11-1 shows an example of a simple repeat loop.
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Figure 11-1. A simple repeat loop OK, so this didn t do much; it just beeped. Also, the operation was performed identically each time, without any variation. But that s the idea I m demonstrating here an assembly line that performs the same operation every time. If you have an assembly line in a soda can factory, for instance, you may want a tool to apply a label to each can. The operation will be identical, but the can will be a different can every time. In other words, you ll have identical cans but different instances one tool is used to perform as many operations as you want, saving you a lot of time! This is the most basic form of a repeat loop: repeat --Do something... end repeat
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CHAPTER 11 THE ASSEMBLY LINE: CREATING REPEAT LOOPS
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Notice that the statement starts with the word repeat and ends with an end repeat line. This is a requirement for all repeat statements. Between these two lines you will put all the statements that will be executed every time the loop repeats. What s sorely missing in the preceding repeat statement is a consideration that the wizard s apprentice didn t take into account: what will make the repeat loop stop AppleScript has two basic ways to specify when the repeat loop should end and move on to the statement following the repeat loop: Predetermined count, which means the number of repetitions will be known to the script before the loop starts Signaled condition, which means the loop will continue repeating until a condition is met AppleScript provides a few variations on these two themes. Some loops repeat a predetermined number of times, and some loops keep repeating until a specific condition is met. For instance, if you loop through a list of folders and do something to each folder, the number of repetitions will normally depend on the number of folders, which is unknown at the time you write the script but will be determined by the script when it runs. You can also include one or more statements inside the repeat statement block that set a condition that if true, the repeat loop will stop; otherwise, the loop will just continue. What follows are the variations of the repeat control statement, followed by a detailed explanation of each one.
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Understanding the Code Variations of Repeat Loops
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Script 11-1 lists the different flavors of repeat loops. These flavors are explained in detail later in the chapter. Script 11-1. (includes the six following scripts) repeat --statement/s to repeat end repeat The previous script repeats forever. The following one repeats a specific number of times: repeat n times -- n is an integer --statement/s to repeat end repeat This repeats with a loop variable: repeat with i from start_integer to end_integer -- i changes value with each loop --statement/s to repeat end repeat
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CHAPTER 11 THE ASSEMBLY LINE: CREATING REPEAT LOOPS
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And the following is an extended version of the previous repeat form; it repeats with a loop variable, jumping by intervals other than 1: repeat with i from start_integer to end_integer by step_interval -- i changes value with each loop by the step_interval --statement/s to repeat end repeat This repeats until a certain Boolean condition becomes true: repeat until boolean_expression --statement/s to repeat end repeat This repeats while a certain Boolean condition is true: repeat while boolean_expression --statement/s to repeat end repeat
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Repeating (Forever)
Well, you never would really repeat forever, although I m sure OS X is capable of running continuously for that long! By forever, I mean that the repeat statement itself doesn t contain any provisions for ending the loop. Although you can loop forever, you can, and should, include a way for the loop to terminate inside the repeat loop block. You ll learn more about terminating loops a bit later in the Exiting a Loop Programmatically section.
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