JavaScript is fundamentally a pass-by-value language. This means that when you pass a variable to a function, JavaScript always passes the value of the variable, not the actual reference to that variable. However, the behavior can appear differently depending on the type of value being passed—primitive types versus reference types.
Primitive Types
For primitive types (such as numbers, strings, booleans, null, undefined, and symbols), JavaScript copies the value of the variable and passes this copy to the function. Any modifications to this value within the function do not affect the original variable outside the function. This behavior is a clear example of pass-by-value[1][2][3][4][5][6][7].
Reference Types
When dealing with reference types (like objects, arrays, and functions), JavaScript still uses pass-by-value, but what it actually passes is a copy of the reference to the object. This might seem like pass-by-reference because if you modify the object's properties inside the function, those changes will be reflected outside the function as well. However, if you try to reassign the entire object inside the function, this will not change the original object outside the function. This distinction is crucial and c...
