Web Reference: Jul 23, 2025 · Primitive types (like numbers, strings, booleans) are always passed by value—a copy of the value is passed. For objects and arrays, JavaScript passes the reference value, which is essentially a pointer to the memory location of the data. 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. Feb 18, 2026 · Objects and arrays are reference types. When you assign an object to a variable or pass it into a function, JavaScript copies the reference, not the actual object.
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