CODEWITHSUNDEEP

javascriptnode.js

adelriosantiago

adelriosantiago

Reputation: 8124

Lowest-level way to observe object changes

A real-time app that must broadcast a big object to all clients as soon as it changes.

What is the the lowest-level way to observe any change in a Node.JS object?

For example, given the object:

var obj = {
  num: 3,
  deep: {
      num: 5
  }
}

A function would be triggered after calling any of these:

obj.num = 10;
obj.num.deep.num = 10;
obj.num.deep = undefined;
And so on...

Is it possible? How?

I can't use:

WatchJS: Because it uses polling.
Getters/setters: Because the object structure is not known.

Upvotes: 0

Views: 263

Answers (1)

Reputation: 6903

Depending on your requirements, this should be doable by exposing a proxy of your object instead of the object itself. You could then intercept the setter in the proxy, and trigger an event from there.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy https://caniuse.com/#feat=proxy

Upvotes: 1

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