Applying ranges for grading

So you're writing the grading iOS app for your local Highschool. The teachers want to enter a number value from 0 to 100 and receive the grade character for it (A - F). Pattern Matching to the rescue:

let aGrade = 84



switch aGrade {

case 90...100: print(\"A\")

case 80...90: print(\"B\")

case 70...80: print(\"C\")

case 60...70: print(\"D\")

case 0...60: print(\"F\")

default: print(\"Incorrect Grade\")

}

You can also always have ranges as parts of nested types, such as tuples or even struct types, when you implement the ~= operator.

let student = (name: \"John Donar\", grades: (english: 77, chemistry: 21, math: 60, sociology: 42))

switch student {

case (let name, (90...100, 0...50, 0...50, _)): print(\"\(name) is good at arts\")

case (let name, (0...50, 90...100, 90...100, _)): print(\"\(name) is good at sciences\")

default: ()

}