Web Reference: By controlling how variables are declared, we can choose to wrap them into objects so that they can always be passed by reference, essentially. This is similar to one of the Eduardo Cuomo's answer above, but the solution below does not require using strings as variable identifiers. •• Jan 22, 2026 · JavaScript passes primitive data types (Boolean, Null, Undefined, String, Number) by value, meaning changes do not affect the original data. Non-primitive data types (Object, Array, Function) are passed by value of their reference, so changes can impact the original memory location.
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