Question

Possible Duplicate:
Get a function’s arity

How can I declare a function expression, pass it into a defined function, and have the defined function determine how many arguments the function expression has?

See this code snippet for reference:

function getArgumentCount(fexp)
{
    return ...;
}

var fexp1 = function(a) { };
var fexp2 = function(a, b) { };

console.log(getArgumentCount(fexp1)); // Should output 1
console.log(getArgumentCount(fexp2)); // Should output 2

Answer 1

javascript functions have a .length property

https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Function/length