What I meant by option objects is a dictionary object holding all parameters. doStuff({userId: foo, itemId: bar}); This allows the order of key/val pairs to m

What I meant by option objects is a dictionary object holding all parameters. doStuff({userId: foo, itemId: bar}); This allows the order of key/val pairs to move around, making it more robust to mistakes than doStuff: (string,string) => void.