Dynamic Arguments in Javascript

Question

In Javascript, you are supposed to be able to access the arguments passed to a function via the arguments key word. This should alert "tony" and "magoo" but instead it alerts "undefined" - why?

function myFunction(){
    for(var i=0; i<arguments.length; i++){
        alert(arguments[i].value);
    }
}

myFunction("tony", "Magoo");

Note it's not a keyword, strictly speaking. It's basically just a variable. — pimvdb
– pimvdb, Commented Mar 17, 2012 at 16:55

Rob W · Accepted Answer · 2012-03-17 16:50:27Z

6

Use arguments[i], without .value.

The arguments object is an array-like object, all arguments can be accessed through numeric indices.

answered Mar 17, 2012 at 16:50

Rob W

350k87 gold badges811 silver badges683 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

dublintech Over a year ago

Great answer. Is there a special name for this characteristic of the language

Rob W Over a year ago

@dublintech There's no special name. It's just a variable, defined on every function instance. If you're looking for even more details: This is the specification for the arguments.

Collectives™ on Stack Overflow

Dynamic Arguments in Javascript

1 Answer 1

2 Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Related