Arguments are function variables that you can use only inside the function:

Also, if you name the arguments the same as the variables outside the function, the function will use the arguments instead of the variables:

Note

When the function finishes execution, its space disappears, and all arguments lose their values.

Arguments are received sequentially:

Unfilled arguments will receive the value undefined and will not be displayed in any way. Redundant arguments will not be used:

The function receives values as arguments. Variables outside the function remain unchanged. An argument is an independent value inside a function:

Note

This does not work the same way for arrays because an array contains a reference to some data. This reference is passed to the function, so changes inside the function affect the data outside. This will be studied in the "OOP in JavaScript" course.