It's not a new operator, but rather the X= form, where `foo X= 4` is sugar for `foo = foo X 4` Just be careful with this in JavaScript, as the greater number o

It's not a new operator, but rather the X= form, where `foo X= 4` is sugar for `foo = foo X 4` Just be careful with this in JavaScript, as the greater number of things that are falsy can bite you if you do `a = a || 10;`, which is a very common JS bug.