Is it possible to boost memory with a JavaScript object alias?

Question

Is it possible to boost memory with a JavaScript object alias?

Is memory consumption increased when copying/aliasing a JavaScript object?

For example, if I want to create a shortcut to an object:

// total memory 12k
// object.someobject 12k
var a = object.someobject;

Question 1: Does this use up 24k or just 12k of memory?

// and if I do
// object2 10k
var b = object2;
var c = $.extend(a,b);

Question 2: How much memory am I using now?

Question 3: If memory is increased, what is the best practice for creating shortcuts to objects?

-- EDIT --

Question 4: What happens if I delete or set 'a' to null?

javascript

Answer 1

Answer №1

In my understanding of jQuery's use of the extend function, when extending both a and c, they become the same object.

The properties of b are simply copied to a using a reference, so the memory consumption is minimal; only the keys from b are added to a.

Here is an example in code:

var a = { "foo": {} }; // memory: creating a,
var b = { "bar": {} }; // memory: creating b
var c = $.extend(a, b); // memory: adding key 'bar' to `a`
c === a; // true
a.bar === b.bar; // true
({}) === ({}); // false (as expected)

Answer 2

In my understanding of jQuery's use of the extend function, when extending both a and c, they become the same object.

The properties of b are simply copied to a using a reference, so the memory consumption is minimal; only the keys from b are added to a.

Here is an example in code:

var a = { "foo": {} }; // memory: creating a,
var b = { "bar": {} }; // memory: creating b
var c = $.extend(a, b); // memory: adding key 'bar' to `a`
c === a; // true
a.bar === b.bar; // true
({}) === ({}); // false (as expected)

Is it possible to boost memory with a JavaScript object alias?

Answer №1

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