function builder library idea

gistfile1.txt

// requires at least 1 object parameter and optionally a function callback
var foo = sani(['object+|array', 'function?'], function (objs, callback) {
  if (callback) callback();
  return objs.length;
});
 
foo(1, 2);
// throws error
 
foo({}, {});
// 2

foo();
// throws error
 
var cb = function () { console.log('hello'); };
 
foo([{}], cb);
// 1
// LOG: 'hello'
 
foo(cb);
// throws error
 
foo.overload(['function'], function (callback) {
  console.log('overloaded!')
  if (callback) callback();
});
 
foo(cb);
// LOG: 'overloaded!
// LOG: 'hello'

//optional many numbers and requires a function callback
var bar = sani(['number*', 'function'], function (objs, callback) {
  console.log(objs.length);
  callback();
});

bar(cb);
// LOG: 0
// LOG: 'hello'

bar();
// throws error

bar(1, 2, 3, cb);
// LOG: 3
// LOG: 'hello'

// arg spec didn't specific it could also be an array
bar([1, 2, 3], cb);
// throws error