Javascript Variables And Objects Passed XdJO5u0V7ew

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. Declaring JavaScript Variables Creating a variable in JavaScript is called declaring a variable. You declare a JavaScript variable with the let keyword or the const keyword.

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