How JavaScript handles passing data is a source of confusion and bugs for many developers, especially when it comes to object types.

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 JavaScript is always pass-by-value. This means everything in JavaScript is a value type and function arguments are always passed by value. That being said, object types are a bit more confusing. Object types are reference types which are passed byvalue. The subtle difference here lies in the fact that an object reference is not the same as passing an object by reference.

Is JavaScript pass-by-value or pass-by-reference?

The issue is that this is wrong. The original variable refers to a memory location, and passes that memory location to the function. Then, when the original variable is redirected to reference a new memory location… the function still keeps the reference to the original location.
So variables are references, they pass references, and when the are redefined, the reference itself is changed.

It has a good explanation about pass-by-value/pass-by-reference. Thanks.

everyone should know… nice article