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Create QR-Code in Objective-C THE ASSEMBLY LINE: CREATING REPEAT LOOPS

CHAPTER 11 THE ASSEMBLY LINE: CREATING REPEAT LOOPS
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The following sections summarize the chapter in an intensive reference style. Use this part to look up facts related to the chapter without the chatter.
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Using a Simple Repeat Loop
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The simplest repeat loop will repeat until stopped either by an exit repeat statement inside the loop or by the user pressing Command+. (period). With every repetition, the script will be executing the statements between the repeat line and the end repeat line. repeat --Do something... end repeat
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Exiting a Repeat Loop
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You exit a repeat loop with the exit repeat statement. This statement usually sits in a conditional statement that determines when the loop has reached its potential. Here s how you use the exit repeat statement: repeat --Do something... if time_to_stop_loop is true then exit repeat end if end repeat
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Using the Simplest Repeat Loop
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Use the following version of the repeat statement to repeat a specific number of times: repeat 12 times --statements to execute repeatedly end repeat
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Loop variables are variables that automatically change with each repetition. In the following script, the variable i is the loop variable. It will start with the value of 1 and increment by 1 with every repetition. The loop will stop when the value of i has reached the number indicated at the end of the repeat line: repeat with i from 1 to 10 --The value of the variable i starts with 1 --and grows by 1 with each loop end repeat Here s another example: repeat with i from 1 to (count characters of user_name) --statement to execute repeatedly end repeat
CHAPTER 11 THE ASSEMBLY LINE: CREATING REPEAT LOOPS
You can use the by parameter to change the repeat variable to any other number. The loop in the following script will have 20 repetitions: repeat with i from 5 to 100 by 5 --The value of the variable i starts with 5 and grows by 5 up to 100. end repeat You can also count backward (see Script 11-13). Script 11-13. repeat with i from 20 to 0 by -2 --The value of the variable i starts with 20 and --decreases by 2 until it reaches 0. end repeat
Repeating Actions on Items in a List
When you have a list whose items need to be processed in order, you can make the loop variable take on the value of the next item in the list each time. In Script 11-14, the value of the loop variable will be a different value from the employee_names list. Script 11-14. set employee_names to {"Jena","Jack","Bonnie","Frank"] repeat with the_name in employee_names --The value of the variable the_name -- starts with "Jena" in the first loop, then "Jack", etc. end repeat
Using repeat while
You can repeat while a certain condition is true. This allows you to repeat the execution of statements without setting a predefined loop count. Script 11-15 will loop as long as there s an open document in FileMaker Pro. Since the repeating statement closes the front open document, all documents will be eventually closed, the Boolean expression document 1 exists will evaluate as false, and the loop will conclude. Script 11-15. tell application "FileMaker Pro" repeat while (document 1 exists) close document 1 end repeat end tell
Using repeat until
The repeat until flavor of the repeat loop works the opposite way from the repeat while statement. You supply the repeat loop with a Boolean expression, and as soon as that expression evaluates as true, the loop will stop. See Script 11-16.
CHAPTER 11 THE ASSEMBLY LINE: CREATING REPEAT LOOPS
Script 11-16. tell application "FileMaker Pro" repeat until (count documents = 0) close document 1 end repeat end tell
Using Counter Variables
Counter variables are like loop variables, but you decide on their value. The typical counter variable will increase in value by 1 with every loop. You can have multiple counters that serve different purposes, as in Script 11-17. Script 11-17. set year_counter to 0 set dog_year_counter to 0 repeat set year_counter to year_counter + 1 set dog_year_counter to dog_year_counter + 7 set the_message to "After " & year_counter & " years, your dog is really " & dog_year_counter & " years old." try display dialog the_message on error -128 -- user canceled exit repeat end try end repeat
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