how to create functions with variable arguments in javascript?

Question

I want to create a function in javascript with a variable amount of arguments. The next example is how I want to call this function:

myFunction(1,2);
myFunction(1,2,3);
myFunction(1,2,3,4);
myFunction(1,2,3,4,5);
myFunction(1,2,3,4,5,6);

Anyone knows how to define this function?

Answer 1

You can access the arguments by their ordinal position without the need to state them in the prototype as follows:

function myFunction() {
  for (var i = 0; i < arguments.length; i++)
    alert(arguments[i]);
}

myFunction(1, 2, "three");

>>1
>>2
>>three

Or if you really are passing in a set of semantically related numbers you could use an array;

function myFunction(arr) { ... }
result = myFunction([1,2,3]);

Answer 2

Latest update

Rest parameters are supported in all new browsers. Check here for details

The rest parameter syntax allows us to represent an indefinite number of arguments as an array, which you can pass it to other functions too.

function myFunction(...data){
  console.log(...data);
  myOtherFunction(...data);
}

myFunction(1,2,3);     //logs 1,2,3

myFunction([1,2,3]);   //logs [1,2,3]

Answer 3

Use the 'arguments' variable like this :

function myFunction() {
    alert(arguments.length + ' arguments');
    for( var i = 0; i < arguments.length; i++ ) {
        alert(arguments[i]);
    }
 }

Call the methods as you did before

myFunction(1,2);
myFunction(1,2,3,4,5,6);