Looping with for loops

for loops allow you to execute code for each element in a collection or range. In this recipe, we will explore how to use for loops to perform actions on every element in a collection.

How to do it...

Let's create some collections and then use for loops to act on each element in the collection:

1. Create an array of elements, so we can do something with every item in the array:

let theBeatles = ["John", "Paul", "George", "Ringo"]

2. Create a loop to go through our theBeatles array and print each string element that the for loop provides:

for musician in theBeatles { 
    print(musician) 
} 

3. Create a for loop that executes some code a set number of times, instead of looping through an array. We can do this by providing a range instead of a collection:

// 5 times table 
for value in 1...12 { 
    print("5 x \(value) = \(value*5)") 
}

4. Create a for loop to print the keys and values of a dictionary. Dictionaries contain...