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Simple if and unless statements do not return a value, but this is not a problem since we can write a conditional expression using the ternary operator. For multiple-branch conditions, we have to be more inventive, but again Perl provides several ways for us to achieve this goal. One way to go about it is with logical operators using a do block.

In an OOP design, an employee contact info object would typically include an init function that takes an employee ID That init function would return a self-contained object with employee data and the functions to change that data Let s look at an Employee CFC from a typical object-oriented application, in Listing 22-1 Listing 22-1 Employee OO CFC example <cfcomponent> <cfset thisFirstName = ""> <cfset thisLastName = ""> <cffunction name="Init"> <cfset thisFirstName = "James"> <cfset thisLastName = "Smith"> <cfreturn this> </cffunction> <cffunction name="GetFullName"> <cfreturn thisFirstName & " " & thisLastName> </cffunction> </cfcomponent> In contrast to the OO approach, every function in a contact data service would require an employee ID as an argument The get employee info function would require this ID in order to return information about that employee.

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print do { $value == 1 && "First Place" || $value == 2 && "Second Place" || $value == 3 && "Third Place" || "Try again" }, "\n"; If this approach does not suit our purposes, we can always resort to a subroutine and use return to return the value to us. sub placing { $_[0] == 1 and return "First Place"; $_[0] == 2 and return "Second Place"; $_[0] == 3 and return "Third Place ; return "Try Again"; } print placing ($value), "\n"; Or, using the ternary operator: sub placing { return $_[0] == 1 "First place" : $_[0] == 2 "Second place" : $_[0] == 3 "Third place" : "Try Again"; } While this works just fine, it does not scale indefinitely. For situations more complex than this, it can be easier to decant the conditions and return values into the keys and values of a hash, then test for the hash key. Finally, there is another solution involving using foreach, which we will also consider in Using foreach with Multibranched Conditions.

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A loop is a block of code that is executed repeatedly, according to the criteria of the loop s controlling conditions Perl provides two kinds of loop: Iterating loops, provided by for and foreach Conditional loops, provided by while and until The distinction between the two types is in the way the controlling conditions are defined The for and foreach loops iterate over a list of values given either explicitly or generated by a function or subroutine The sense of the loop is for each of these values, do something Each value in turn is fed to the body of the loop for consideration When the list of values runs out, the loop ends The while and until loops, on the other hand, test a condition each time around the loop The sense of the loop is while this condition is satisfied, keep doing something.

If the condition succeeds, the loop body is executed once more If it fails, the loop ends There is no list of values and no new value for each iteration, unless it is generated in the loop body itself Both kinds of loop can be controlled using statements like next, last, and redo These statements allow the normal flow of execution in the body of a loop to be restarted or terminated, which is why they are also known as loop modifiers We have already talked about loop modifiers briefly in 2, but will learn more about them later in this chapter Because Perl is such a versatile language, there are also ways to create loop-like effects without actually writing a loop Perl provides functions such as map and grep that can often be used to produce the same effect as a foreach or while loop but more efficiently.

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