Using JavaScript, pass a single parameter to a function that accepts multiple arguments

Question

Using JavaScript, pass a single parameter to a function that accepts multiple arguments

Within my service, the Angular function is defined as follows:

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

When calling this function in the controller:

mySer.isConfigurable(null, conf);

I find passing null to be a bit awkward.

I attempted to call mySer.isConfigurable(conf); but this caused conf to match with the first parameter of the function.

Is there another method for only passing conf?

javascript angularjs

Answer 1

Answer №1

Perhaps a simple solution would be to adjust the sequence in which the parameters are declared?

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

By doing this, you can utilize mySer.isConfigurable(conf); without specifying product, causing it to default to undefined and evaluate as false.

Answer 2

Perhaps a simple solution would be to adjust the sequence in which the parameters are declared?

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

By doing this, you can utilize mySer.isConfigurable(conf); without specifying product, causing it to default to undefined and evaluate as false.

Answer 3

Answer №2

If your function has a varying number of parameters, you can utilize the arguments object

Check out the documentation here

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

Your code should look something like this:

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

This code allows you to call the function with one or two or even n number of parameters:

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

Answer 4

If your function has a varying number of parameters, you can utilize the arguments object

Check out the documentation here

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

Your code should look something like this:

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

This code allows you to call the function with one or two or even n number of parameters:

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

Answer 5

Answer №3

If you prefer not to utilize the null keyword, then the necessary step is to switch the order of your function parameters as shown below.

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

Subsequently, when calling this function with only one parameter, that value will be assigned to the config parameter while product parameter will default to undefined.

 mySer.isConfigurable(conf);

Answer 6

If you prefer not to utilize the null keyword, then the necessary step is to switch the order of your function parameters as shown below.

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

Subsequently, when calling this function with only one parameter, that value will be assigned to the config parameter while product parameter will default to undefined.

 mySer.isConfigurable(conf);

Using JavaScript, pass a single parameter to a function that accepts multiple arguments

Answer №1

Answer №2

Answer №3

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