Pass one parameter in multiple arguments function in javascript

Question

My angular function is defined in a service somethin like,

$delegate.isConfigurable = function (product, config) {
                if (product) {
                    ///.....
                }
                return config.getDetail();
            };

Now, on the controller, I am calling this through:

mySer.isConfigurable(null, conf);

But passing null looks a little awakard to me.

I tried calling mySer.isConfigurable(conf); but this makes conf match to first parameter of the function.

Instead, are there any other way of passing only conf ?

Caleb · Accepted Answer · 2017-05-06 02:40:50Z

3

Maybe you can just switch the order that the parameters are defined?

$delegate.isConfigurable = function (config, product) {
            if (product) {
                ///.....
            }
            return config.getDetail();
        };

Then you can call just mySer.isConfigurable(conf); and product be undefined in that case, and will evaluate to false.

answered May 6, 2017 at 2:40

Caleb

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2 Comments

now he who must not be named. Over a year ago

Switching paramaters is fine.. but any generic ways of doing this ?

Caleb Over a year ago

I don't believe there is. It may also be confusing to see the same function called with the only param actually being a different variable when it's called in different places. I suppose you could also make 2 separate helper functions that call this isConfigurable function with different parameters.

Santosh · Accepted Answer · 2017-05-06 02:52:12Z

If you have a function that have varying number of parameters then you can use the arguments object

Here is the documentation

The arguments object is an Array-like object corresponding to the arguments passed to a function.The arguments object is a local variable available within all functions

So your code will be

$delegate.isConfigurable = function() {
  var param = null,
    config = null;
  if (arguments && arguments.length == 2) {
    // you have param and config
    param = arguments[0];
    config = arguments[1];
  } else if (arguments && arguments.length == 1) {
    config = arguments[0];
  }
  return config.getDetail();
};

And you can call this by one or two or n number of param

mySer.isConfigurable(conf)
mySer.isConfigurable(param,conf)
mySer.isConfigurable(param1,param2,conf)

Upalr · Accepted Answer · 2017-05-06 03:01:10Z

3

If you don't want to use null then you need to interchange your function parameter like bellow.

$delegate.isConfigurable = function (config, product) {
                if (product) {
                    ///.....
                }
                return config.getDetail();
            };

And now if you call that function passing one parameter that will be the value of config and product parameter will be passed as undefined.

 mySer.isConfigurable(conf);

edited May 6, 2017 at 3:01

answered May 6, 2017 at 2:40

Upalr

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2 Comments

now he who must not be named. Over a year ago

Switching paramaters is fine.. but any generic ways of doing this ?

Estus Flask Over a year ago

@nowhewhomustnotbenamed. Yes, this is how it is usually done. Mandatory params go first, exactly to avoid the issue you're having. Otherwise there should be tedious parsing of arguments, as the other answer explains.

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