JSON对象内存分配与变量

Question

I have a question related to memory allocation of JSON object. Will JSON take more memory than individual variable. For Ex:

var testVar1 = "testVar1"; //  8*2 bytes for char + integer pointer (8bytes)
var testVar2 = "testVar1";//  8*2 bytes for char + integer pointer (8bytes)
var testVar3 = "testVar1";//  8*2 bytes for char + integer pointer (8bytes)

vs
testVariables = {
"testVar1":"testVar1",
"testVar2":"testVar2",
"testVar3":"testVar3"
}   

When I open up memory profiler, testVariables retain memory seem to be more than sum of individual variable memory( retain). Please let me know which is a better solution

Answer 1

When you create 3 new variables, the Javascript engine will be create 3 new properties in the scope object and affect their values.

When you create a object witch contain 3 property. The engine create 1 new property to the scope object. It affect a new instance of Object to it that contain the 3 property references and their values.

So in second case you have 1 reference and 1 object instance more than the first case.