I wrote a function that verifies the arguments against an expected set of arguments.
test('hello', 'world');
function test() {
verifySignature(arguments, String, [Number], String)
// returns true
}
function test() {
verifySignature(arguments, String, Number)
// returns false
}
test('hello', 'world');
function test() {
alert(verifySignature(arguments, String, Number));
}
function verifySignature() {
var args = arguments[0];
var expectations = Array.prototype.slice.call(arguments, 1);
for (var i = 0; i < expectations.length; i++) {
// Going through each expectation
if (expectations[i] instanceof Array) {
console.log('Comparing [', args[i], '] with [', Object.prototype.toString.call(new expectations[i][0]));
// optional expectation
if (Object.prototype.toString.call(args[i]) == Object.prototype.toString.call(new expectations[i][0])) {
// good
} else {
// or maybe the next one will be good
expectations.shift();
i--;
}
} else {
console.log('Comparing [', args[i], '] with [', Object.prototype.toString.call(new expectations[i]));
// required! expectation
if (Object.prototype.toString.call(args[i]) == Object.prototype.toString.call(new expectations[i])) {
// good
} else {
// error!
return false;
}
}
};
return true;
}I was actually looking for a library that already does this, if I missed one, please point me to it.
I initially thought something like this would be a big project in itself. So I'm not really confident and fully expect to improve a lot on it as I use it more and more. Please review and suggest corrections and improvements.
