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Fun With Functions

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posted by ps1
09-11-2008
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Fun With Functions
  1. #A familiar function 
  2. function Add($number1, $number2) 
  3. { 
  4.     $result = $number1 + $number2 
  5.     return $result 
  6. } 
  7.  
  8. #Call the function Add. Notice we're not using Add(1,2) or Add 1, 2 
  9. Add 1 2 
  10.  
  11. #We don't even need return since the last value is automatically returned 
  12. function Subtract($number1, $number2) 
  13. { 
  14.     $number1 - $number2 
  15. } 
  16.  
  17. #Call it 
  18. Subtract 10 4 
  19.  
  20. #Optional parameters and initialization 
  21. function Multiply([int]$number1, [int]$number2=10) 
  22. { 
  23.     $number1 * $number2 
  24. } 
  25.  
  26. #Call it with just one value 
  27. Multiply 5 #returns 50 
  28.  
  29. #Call it with two strings 
  30. Multiply "test" "strings" #Error: Cannot convert value "test" to type "System.Int32" 
  31.  
  32. #Just for fun let's put a couple together. The parenthesis are required. 
  33. Multiply (Add 2 3) (Subtract 10 5) #returns 25 

This exercise illustrates some simple functions. Notice that when you call functions you don't use parenthesis or commas like a programmer might be inclined to do. Also notice that the we don't even need to use the keyword return since the last value of the function is automatically returned.

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