How to add parameters to a function passed as a paramter?

[Steve Neill]

Here's an interesting problem...

I have 2 functions, aFunc() and bFunc(). I call aFunc() passing a call
to bFunc() as a parameter. Function aFunc() executes bFunc(). Function
bFunc() lists the parameter values passed to it.

OK, here's the twist...

I want to add some parameters to bFunc() from inside aFunc(). Can that
be done?

Sorry no prizes, except the satisfaction of the solution :)

Regards,
Steve
aFunc(function() { bFunc(); } );

function aFunc(f) {
var x = 1;
var y = 2;

// add x, y as parameters to function f()
// ???

// execute the parameter function
f();
}

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

[Michael Winter]

On 26 Oct 2004 14:21:29 -0700, Steve Neill <sn****@mxlogic.com> wrote:

I have 2 functions, aFunc() and bFunc(). I call aFunc() passing a call
to bFunc() as a parameter. Function aFunc() executes bFunc(). Function
bFunc() lists the parameter values passed to it.

OK, here's the twist...

I want to add some parameters to bFunc() from inside aFunc(). Can that
be done?

Yes, but your call to aFunc needs to be changed.

Functions are objects, and just like all other objects, you can refer to
them with any number of identifiers. Consider:

function myFunction() {
}

var yourFunction = myFunction;

You can now invoke myFunction with either myFunction() or yourFunction()
with exactly the same results. For your particular case, this would become:

function aFunc(f) {
var x = 1,
y = 2;

f(x, y); // Call bFunc with arguments x and y.
}

function bFunc() {
for(var i = 0, n = arguments.length; i < n; ++i) {
alert(arguments[i]);
}
}

aFunc(bFunc); // Note: no parentheses on bFunc!

Hope that helps,
Mike

--
Michael Winter
Replace ".invalid" with ".uk" to reply by e-mail.

[Bob Gregory]

sn****@mxlogic.com (Steve Neill) wrote in message news:<25**************************@posting.google. com>...

Here's an interesting problem...

<snip />

Am I missing something?

aFunc(bFunc);

function aFunc(f) {
var x = 1;
var y = 2;

// add x, y as parameters to function f()
// ???

// execute the parameter function
f(x,y);
}

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

[Michael Winter]

On 27 Oct 2004 06:12:14 -0700, Bob Gregory <bo********@ppsltd.net> wrote:

[snip]

Am I missing something?
Not especially, but...

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

....the arguments object is not a property of the function, but of the
function's activation object. Effectively, it is a local variable to
accessed like all other local variables.

Mike

--
Michael Winter
Replace ".invalid" with ".uk" to reply by e-mail.

[Steve Neill]

Thank you Michael. I didn't realize I could pass a function that way
(now I do!) This solves the problem -- Thank you