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Thanks for the reply. I think I can understand why two-way data-binding would be bad on a complex app. Or even with more than one person working on the app.

• Klathmon 9y ago
  No problem! And again I do want to stress that two-way binding isn't necessarily bad in my opinion, it just doesn't "require" the explicitness that one way binding does. I have seen 2-way binding work wonderfully when used with some strict guidelines or with external tools that can enforce some of that explicitness. And it can have it's benefits! 2-way data binding is often simpler, and can be faster than one way binding (it's really just a fancy term for "pass by reference").