Loops

import UIKit

// FOR LOOPS

// Over ranges
let count = 1...10
for number in count {
    print("Number is \(number)")
}

// Over arrays
let beatles = ["John", "Paul", "George", "Ringo"]
for beatle in beatles {
    print("\(beatle) was a member of the Beatles.")
}

// Use of underscore _
for _ in 1...5 {
    print("Hi, five times")
}

// WHILE LOOPS
var number = 1
while number <= 20 {
    print(number) // Occurs 20 times
    number += 1
}

// REPEAT LOOPS
number = 1
repeat {
    print(number)
    number += 1
} while number <= 20


// EXITING LOOPS
var countDown = 10
while countDown >= 0 {
    print(countDown)
    if countDown == 4 {
        print("I'm bored. Let's go now!")
        break  // Loop stops after "4"
    }
    countDown -= 1
}

// Exiting multiple loops
outerLoop: for i in 1...10 {  // Note: "outerloop" label
    for j in 1...10 {
        let product = i * j
        print ("\(i) * \(j) is \(product)")

        if product == 50 {
            print("It's a bullseye!")
            break outerLoop     // break
        }
    }
}

// SKIPPING ITEMS IN LOOPS WITH "CONTINUE"
for i in 1...10 {
    if i % 2 == 1 { // If number is odd, loop won't complete
        continue    //
    }
    print(i)
}

// INFINITE LOOPS
while true {
    // Some code
    // Make sure a condition exists to exit!
}