What does foo mean?

Might not be specific to this chapter, but keep seeing the term ‘foo’ for example:

self.object = foo; object = foo;

is it merely just a placeholder? I’ve searched everywhere for an explanation but none found- I think people assume it as a common term…


Yep, you’re right, the words “Foo” and “Bar” are used as a convention, they’re used to indicate something in the programming world.
As you said, it’s just a placeholder, a common one in programming to indicate something in a code example.

Initially I had assumed it referred to the FUBAR acronym as popularized in the movie Full Metal Jacket. I’ve known other professionals who have made that assumption. But it seems that the actual history is more complex and interesting: