Vue's is especially nice in that it handles deep and imperative updates. For example: you have an observable foo, and it has an array bar. You can read foo.bar

Vue's is especially nice in that it handles deep and imperative updates. For example: you have an observable foo, and it has an array bar. You can read foo.bar directly instead of needing a wrapper getter function. You can also update foo.bar = … instead of needing a setter function. You can also call foo.bar.sort() and Vue will pick this up. I see lots of small reactive libraries but a lot of them will not pick up something like foo.bar.sort().