Named Parameters is unclear to me

[Piotr Migdał]

Named Parameters ins unclear to me.

In particular:

• do I refer to them the same way as to "not-named" parameters?
• how do I call this function? ( func(a=1) or func({a= 1}))
• how do I combine named and not-named parameters?

[David Leonard]

In order:

You refer to them the same way as parameters that are not named, which is essentially a function call:

function addNumbers(a, b) {
  return a + b;
}

addNumbers(2, 3);

function someName(a=1) is a function whose default value for a is 1. If you call the function like so:

function someName(a=1) {
  return a + 100;
}

someName( ); // Calling the function with no parameters will return 101, variable (a) takes the value of 1.
someName(3); // Calling the function with (A) returns 103, variable (a) takes the value of 3.

As for using the destructuring operation on a function func({a = 1}):

function addNumbers({a = 0, b = 0}) {
  // Through destructuring, we can access variables a and b here
  return a + b;
}

addNumbers({a: 10, b:20}); // Call the function with the needed parameters

Lastly, we can combine named and not-named parameters like this:

function addNumbers({a = 0, b = 0}, c) {
  // Through destructuring, we can access variables a and b here
  return a + b + c;
}

addNumbers({a: 10, b:20}, 40); // Returns 70

I hope this made sense.

[Piotr Migdał]

@DrkSephy Thanks! Especially the last two lines were not obvious and new to me.