Objective-C Programming: The Big Nerd Ranch Guide

42 Switch Statements

It is not uncommon to check a variable for a set of values. Using if-else statements, it would look like this:

i​n​t​ ​y​e​a​s​t​T​y​p​e​ ​=​ ​.​.​.​;​

i​f​ ​(​y​e​a​s​t​T​y​p​e​ ​=​=​ ​1​)​ ​{​
 ​ ​ ​m​a​k​e​B​r​e​a​d​(​)​;​
}​ ​e​l​s​e​ ​i​f​ ​(​y​e​a​s​t​T​y​p​e​ ​=​=​ ​2​)​ ​{​
 ​ ​ ​m​a​k​e​B​e​e​r​(​)​;​
}​ ​e​l​s​e​ ​i​f​ ​(​y​e​a​s​t​T​y​p​e​ ​=​=​ ​3​)​ ​{​
 ​ ​ ​m​a​k​e​W​i​n​e​(​)​;​
}​ ​e​l​s​e​ ​{​
 ​ ​ ​m​a​k​e​F​u​e​l​(​)​;​
}​

To make this sort of thing easier, C has the switch statement. The code above could be changed to this:

i​n​t​ ​y​e​a​s​t​T​y​p​e​ ​=​ ​.​.​.​;​ s​w​i​t​c​h​ ​(​y​e​a​s​t​T​y​p​e​)​ ​{​ ​ ​ ​ ​c​a​s​e​ ​1​:​ ​ ​ ​ ​ ​ ​ ​ ​m​a​k​e​B​r​e​a​d​(​)​;​ ​ ​ ​ ​ ​ ​ ​ ​b​r​e​a​k​;​ ...