What does "+=" (plus equals) mean?
Expressions with binary operators of the form:
x = x op yCan be written as:
x op= yFor instance:
x += y # x = x + yx /= y # x = x / yx ||= 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.