Control flow
In programming, control flow is the order in which your code is executed. When working with Swift, we can use a variety of control statements. Loops, in particular, are useful for when you want to repeat a task multiple times. Let's take a look at a few different types of loop.
The for…in loop
One of the most common control statements is a for…in loop. It allows you to iterate over each element in a sequence. Let's see what a for…in loop looks like:
for <value> in <sequence> {
// Code here
}We start the for…in loop with for, which is proceeded by <value>. This is actually a local constant (only the for…in loop can access it) and can be any name you like. Typically, you will want to give this value an expressive name. Next, we have in, which is followed by <sequence>. This is where we want to give it our sequence of numbers. Let's write the following into Playgrounds:
for value in range {
print("...
