Augmented assignment

As in many other C-derived languages, we can replace:

x = x + 1

With:

x += 1

There are versions of this for the other mathematical operators:

 -= *= /= %=

Readers should already be familiar with all these operators.

There is no ++ or -- operator in Swift 3. Older versions of the language did, in fact, retain these from the C family of languages, so don't be too surprised if you come across it in older posts on the Web. If you do need to do an i++ or i-- (although for loops make these operators largely unnecessary), use i += 1 or i -= 1.
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