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function and arguments as aguments

Hi. I have the following code:

--------------------------------------
function Tunnel() {
//arguments[0](???);
}

function Sum() {
var sum = 0;
for (i=0; i<arguments.len gth; i++) sum += arguments[i];
alert(sum);
};

// calling Sum directly
Sum(1,2,3,4);

// calling Sum through Tunnel
Tunnel(Sum, 1,2,3,4);
--------------------------------------

How should the Tunnel function be defined, knowing that the number of
parameters passed are unknown?

telmo
Feb 15 '06
41 2568
VK wrote:
function init() {
var out = document.getEle mentById('p1');

alert(arguments .constructor.pr ototype.isProto typeOf(Object.c onstructor.prot otype));
Yields true. Because:

arguments.const ructor.prototyp e.isPrototypeOf (
Object.construc tor.prototype)

| 10.1.8 Arguments Object
| [...]
| * The value of the internal [[Prototype]] property of the arguments object
| is the original Object prototype object, the one that is the initial
| value of Object.prototyp e (section 15.2.3.1).

It is implied that arguments.const ructor is Object().

=== Object.prototyp e.isPrototypeOf (Object.constru ctor.prototype)

Because Object() is a (constructor) function, its constructor property is
Function():

=== Object.prototyp e.isPrototypeOf (Function.proto type)

And because of

| 15.2.4.6 Object.prototyp e.isPrototypeOf (V)
|
| When the isPrototypeOf method is called with argument V, the following
| steps are taken:
|
| 1. Let O be this object.

O := Object.prototyp e;

| 2. If V is not an object, return false.

V = Function.protot ype is an object, nothing done.

| 3. Let V be the value of the [[Prototype]] property of V.

| 15.3.4 Properties of the Function Prototype Object
|
| [...]
| The value of the internal [[Prototype]] property of the
| Function prototype object is the Object prototype object
| (section 15.3.2.1).

V := Function.protot ype.[[Prototype]] = Object.prototyp e

| 4. If O and V refer to the same object or if they refer to objects joined
| to each other (section 13.1.2), return true.

O === V, return true.
alert(arguments .constructor.pr ototype.isProto typeOf(Function .constructor.pr ototype));
Yields true, because of

arguments.const ructor.prototyp e.isPrototypeOf (
Function.constr uctor.prototype )

=== Object.prototyp e.isPrototypeOf (Function.proto type)
=== true

alert(arguments .constructor.pr ototype.isProto typeOf(String.c onstructor.prot otype));

Yields true, because of

arguments.const ructor.prototyp e.isPrototypeOf (
String.construc tor.prototype)

=== Object.prototyp e.isPrototypeOf (Function.proto type)
=== true
// use as argument anything else you want

}

window.onload = init;
</script>

The dark secret of JavaScript (which you should keep in secret :-) is
that at the very bottom of everything it's the same class constructor
based language as any others. [...]


Nonsense.
PointedEars
Feb 20 '06 #41
VK wrote:
<snip>
The dark secret of JavaScript (which you should keep in
secret :-) ...

<snip>

You have made it clear that you 'program' on the basis of mystical
incantation and voodoo; fabricating you own complex web of
'explanations' for the phenomenon you mis-observe and chanting bizarre
sequences of operators, function calls and statements to you computer in
the hope that it will do something resembling what you want, but without
any ability to explain why you are using them.

This subject is not magic, there are no secrets (dark or otherwise),
just mechanism; pure deterministic mechanical logic. Seeing yourself as
the priest of some esoteric lore and sole knower or the ultimate truth
will only get in the way of your understanding of javascript. After all,
you claim to have been using javascript since the late 1990s, probably
longer than the majority of the regular contributors to this group, and
yet you understand less than people who have only been doing this for
just a couple of years. And you constantly see (but cannot express)
arcane significance in features that are no more than the direct
consequence of the specified mechanism.

Richard.
Feb 20 '06 #42

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