Question

I defined a function that can take any number of arguments but none is required:

function MyFunction() { //can take 0, 1, 1000, 10000, n arguments
//function code
}

Now i would like to write another function that call MyFunction with a variable number of arguments each time:

function Caller(n) {
var simple_var = "abc";
MyFunction() //how can i pass simple_var to MyFunction n times?
} 

Thanks in advance 🙂

Answer 1

Function.apply can be used to pass an array of arguments to a function as if each element in the array had been passed as an individual argument:

function Caller(n) {
   var simple_var = "abc";

   // create an array with "n" copies of the var
   var args = [];
   for (var i = 0; i < n; ++i) {
      args.push(simple_var);
   }

   // use Function.apply to send that array to "MyFunction"
   MyFunction.apply(this, args);
}

Worth to say, argument length is limited to 65536 on webkit.