Passing variable number of arguments from one function to another [duplicate]

Question

Possible Duplicate:
Is it possible to send a variable number of arguments to a JavaScript function?

I can use arguments to get a variable number of arguments within a function, but how can I pass them to another function without knowing its prototype?

function show(foo, bar) { window.alert(foo+' '+bar); } function run(f) { f(arguments); } // not correct, what to do? run(show, 'foo', 'bar'); 

Note: I cannot guarantee the number of arguments needed for the function f that is passed to run. Meaning, even though the example shown has 2 arguments, it could be 0-infinite, so the following isn't appropriate:

function run(f) { f(arguments[1], arguments[2]); } 

Answer 1

The main way to pass a programmatically generated set of arguments to a function is by using the function's 'apply' method.

function show(foo, bar) {   window.alert(foo+' '+bar); } function run(f) {   // use splice to get all the arguments after 'f'   var args = Array.prototype.splice.call(arguments, 1);   f.apply(null, args); }  run(show, 'foo', 'bar'); 

Answer 2

You can in fact do this with apply, if I understand your question correctly:

function show(foo, bar) { window.alert(foo+' '+bar); } function run(f, args) { f.apply(null,args); }  run(show, ['foo', 'bar']);