What does “+=” (plus equals) mean?

Question

I am doing some ruby exercises and it said I need to go back and rewrite the script with += shorthand notations.

This exercise deals primarily with lear

Answer 1

Expressions with binary operators of the form:

x = x op y

Can be written as:

x op= y

For instance:

x += y   # x = x + y
x /= y   # x = x / y
x ||= y  # x = x || y (but see disclaimer)

However, be warned that ||= and &&= can behave slightly ... different (most evident when used in conjunction with a hash indexer). Plenty of SO questions about this oddity though.

Happy coding.