In above case, this basically refreshes text whenever ab or c is modified, however, I can set any of it to undefined to cancel the update operation. Update will occur only if all are not undefined, this allow me to clearly distinguish between undefined and null.
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undefinedis a abort in binding, for example in Web Atoms framework, we can create binding likeIn above case, this basically refreshes text whenever
aborcis modified, however, I can set any of it toundefinedto cancel the update operation. Update will occur only if all are notundefined, this allow me to clearly distinguish betweenundefinedandnull.