Question

I was wondering how does javascript(if possible) access a variable that has the same name as the variable input of the function.

function myfunc(var1)
{
    var var1 = "World";
    alert(var1);
}

How can I tell the function which var1 to print?

Answer 1

nnnnnn is correct, I tested it. Arguments that are passed to a function can be accessed in 2 ways, by their parameter name and through the arguments variable. arguments[0] would be the value of the first parameter.

In the example below you would expect 2 alerts, the first one saying "Hello" and the second saying "World". But they both say "World" proving that assigning var1 actually changes the value of the argument being passed to the function.

function myfunc(var1) {
    var var1 = "World";
    alert(arguments[0]);
    alert(var1);
}

myfunc("Hello");