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+# ECMAScript proposal:  structured partial object "shallow copy" and co-aplied destructuring.
+- [Motivation](#motivation)
+- [High-level API](#high-level-api)
+- [Assignment to an existent object](#assignment-to-an-existent-object)
+
+## Motivation
+
+Fundamentally you need an existent object understand this proposal. From now being with ES6 at this pre-condition you can bring any structured [destruction to variables](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment). For example:
+
+```js
+const myPreCondition = {
+	a : {
+		d : 1,
+	},
+	b : {
+		e : 2,
+		f : 3,
+		g : 7
+	},
+	c : 2
+};
+
+// then this creates two const : a and b
+const { a, b } = myPreCondition;
+```
+
+And then, for example, we can assign this variables to the other existent object in a way like this:
+
+```js
+const myOtherObject = {};
+// something like this
+Object.assign(myOtherObject, { a, b } = myPreCondition);
+
+// or let assume previous code as pre-condition
+// so we have a and b as const at this moment
+Object.assign(myOtherObject, { a, b });
+```
+
+
+So, the idea is about to extract only some necessary props to the other object directly, wich means without any intermediate actions.
+
+
+## High-level API
+
+This example declaration with **extraction** we suppose `extra` will become an object as receive `a` and `c` from `myPreCondition` as properties:
+
+```js
+const extra = myPreCondition.{ a, c };
+
+console.log(Object.keys(extra)); // ['a', 'c']
+console.log(extra); // { a : { d : 1 }, c : 2 }
+```
+
+This means we did `Object.assign` directly, without any intermediate memory consumption, just made key `a` in `extra` as pointer to `a` of `myPreCondition` and made key `c` as immediately destructured `2` as it was pointed to numeric vector value.
+
+Partial **deep extration** example:
+
+```js
+const deepExtra = myPreCondition.{ a, c, b.{e} },
+console.log(Object.keys(deepExtra)); // ['a', 'c', 'e']
+```
+
+Partial **spread extration** example:
+
+```js
+const deepSpreadExtra = myPreCondition.{ a, b.{ ... } },
+console.log(Object.keys(deepExtra)); // ['a', 'e', 'f', 'g']
+console.log(deepExtra); // { a : { d : 1 }, e : 2, f : 3, g : 7 }
+```
+
+## Assignment to an existent object
+
+```js
+
+const existentObject = { a: 8, e : 1, f : 2 };
+
+existentObject.{ ...myPreCondition.{ c, b.{e, f} } };
+
+console.log(Object.keys(existentObject)); // ['a', 'c', 'e', 'f']
+
+console.log(existentObject); // { a : 8, c : 2, e : 2, f : 3 }
+console.log(existentObject.e); // 2, as it was at myPreCondition.b.e;
+console.log(existentObject.f); // 3, as it was at myPreCondition.b.f;
+```
+
+So, the behaviour is the same as it was `Object.assign`, but for sure can be optimized under the hood of V8.
+And in an addition we can throw an exception, if nested prop does not exists. But also we can bring some compatibility with other proposals with pre-cheking if property exists `obj?.deep?.nested` or `obj?deep?nested` or `obj.?deeo.?nested`, nevermind how it will be finally implemented.