Arrays in function parameters?

Question

Is it possible to do the following (or an equivalent):

function a(foo, bar[x]){
 //do stuff here
}

Thanks in advance.

• Philippe Leybaert: This is not valid syntax. What are you trying to accomplish?
• Mik378: Javascript is not a static language, so just bar fits. You can't expect an array, but you can validate the argument at the top of the body.
• Claudio Redi: No, that make no sense :) what are you trying to do exactly?
• durbnpoisn: What you should be doing is to resolve the bar[x] first and pass THAT into the function.

Answer 1

Since JavaScript is not statically typed, you cant insist on an array. You can do something like this: (far from perfect but usually does the job)

function a(foo, bars) {
 if (!Array.isArray(bars))
 bars = [bars];
 // now you are sure bars is an array, use it
}

I find that naming arrays in the plural, e.g. "bars" instead of "bar", helps, YMMV.

Answer 2

yes, it is possible, as you have noticed you never especify de type of your variables, you only do var a = 1 so here is the same case, you dont have to tell javascript it is an array, just pass it, it will work

function myFunction(foo, array){
}

and the call

var myFoo = { name: 'Hello' };
var myArray = [ 1, 2 ]
myFunction(myFoo, myArray);

hope it helps

• user3616018: That's answered my question! Thank you!