[Rework]: Array

[meatball133]

No description provided.

[heitara]

What about the following way to append an item.

var x = [1]
let y = [2]
x += y
print(x)

I believe it's much easier to reason about.

An explanation why += works as expected.

struct Vector
{
    var x: Double = 0
    var y: Double = 0

    init(x: Double, y: Double)
    {
        self.x = x
        self.y = y
    }
}
func += (left: inout Vector, right: Vector)
{
  left.x += right.x
  left.y += right.y
}

[heitara]

Suggested change

	An array ofn strings can be converted to a single string using the [`joined(separator:)`][joined] method.
	An array of n strings can be converted to a single string using the [`joined(separator:)`][joined] method.

[heitara]

Suggested change

	The `joined(separator:)` property takes a single argument, the separator to be used between elements of the array.
	The `joined(separator:)` method takes a single argument, the separator to be used between elements of the array.

[heitara]

Suggested change

	The `joined(separator:)` property takes a single argument, the separator to be used between elements of the array.
	The `joined(separator:)` property takes a single argument, the separator to be used between elements of the array.
	> Don't forget to convert you Array to `Array<String>`, otherwise `joined(separator:)` won't work.

Here is a snippet, that shows the conversion. This might be too complicated at this early stage.

let evenInts = [2, 4, 6, 8, 10, 12]
let evenIntsString = evenInts.map({"\($0)"}).joined(separator: ", ")

[heitara]

We can add a note how this is achieved and that Generics will be introduced later. For example:

Suggested change

	Arrays are ordered lists of elements where the elements can be of any type, however, all elements of any given list must have the same type.
	Arrays are ordered lists of elements where the elements can be of any type, however, all elements of any given list must have the same type.
	> All primary collection types are implemented using generics. This is the reason why they can work with elements from already defined types or new data types that you will define.

[heitara]

Why not using Strings. Each card can be represented by a String? What's the difference?

[meatball133]

It is just what the instructions say to make it easier, as you might notice this is not a new implementation of the exercise (I didn't write the exercise), more of a rewrite of the text. The idea is that the exercise stay the same.

[heitara]

Suggested change

	She has a stack of cards that she wants to manipulate.
	She has a stack of cards that she wants to manipulate. The stack of cards can be represented by an array of strings, because regular cards contains numbers ( 1 to 10) and Jack, Queen and King, which we can denote with "J", "Q" and "K". To make it more fun you can use emojis. For example: "♦️J"

[heitara]

Suggested change

	[count]: https://developer.apple.com/documentation/swift/array/count
	[count]: https://developer.apple.com/documentation/swift/array/count
	[isEmpty]: https://developer.apple.com/documentation/swift/array/isEmpty

[heitara]

Suggested change

	An array can be checked if it's empty with [`isEmpty`][isEmpty] property.

[heitara]

All the tests should be revisited if the cards are represented as strings.