How can I set type of arguments in JavaScript for Google closure compiler?

Question

As you know every function is java script has a variable named 'arguments' in itself that contains all arguments passed to the function.

Consider following code sample:

String.prototype.format = function(pattern){

var args = arguments.slice(1);

// other implementations are removed...

}

In this scenario, Google Closure Compiler tells me that arguments has no method slice.

As a matter of fact, it has a method names slice, but Google Closure Compiler can not determinate the type of arguments array.

But at runtime the code works fine

How can I define the type of arguments for Google Closure Compiler?

What is a best practice?

I've tested several methods, but non of them worked for me.

Without this, our project will not compiled correctly, so we need this, thanks

Thanks

Answer 1

arguments is not an array (it's an array-like object), so it contains no method slice . You can try: var args = [].slice.call(arguments,1); In other words, call the Array.slice -method for the arguments -object to create a real Array out of it. To test run this code in a browser console:

function foo(){
  console.log([].slice.call(arguments,1));
}
foo(1,2,3); //=> logs [2,3]

See also