I was reading through a Scala book the other day, and I noticed this blurb in a section about tail recursion.
(If you don’t fully understand tail recursion yet, see Section 8.9).
The editor in my brain pounced on this end sentence, which cross-references to the same section the reader has just finished.
It took a beat before the programmer side of my brain woke up and noticed the joke.
Tail recursion is when the last instruction in a method is a call to the same method. To take an example from the book,
def boom(x: Int): Int =
if (x == 0) throw new Exception("boom!")
else boom(x - 1) + 1
In this specific case,
boomcalls itself on the last line of the method. That's tail recursion.
And the last sentence in that section is a perfect example.