第二次作業(yè)

作業(yè)一：完成Playgrounds App《學(xué)習(xí)編程1》4-7章

作業(yè)二：完成下面的練習(xí)題

1. Consider the following array, containing a collection of our favorite pizzas:

Create a new Playground and write some code to do the following:

(i) Create this array, as a variable, storing the pizza names in it.

(ii) Print the element of the array that contains "Vegetarian".

(iii) Append the pizza "Pepperoni" to the array, without changing the rest of the array.

(iv) Insert a new pizza, "Ham, Pineapple, and Pesto", at index 2, shuffling everything after along by one index.

(v) Remove the "Cheese" pizza from the array entirely, leaving the rest intact.

(vi) Swap the "Prosciutto" pizza for a "Pumpkin and Feta" pizza, without changing the rest of the array.

(vii) Print out the whole array.

2. Consider the following questions about sets, and see if you can figure out the answer. Then run them in a Playground to find out.

(i)

What would be printed?

(ii)

What’s in this collection?

(iii)

What’s in this set?

(iv)

What does forbiddenPizzas contain now?

3. Consider the following dictionary, representing a bunch of dessert pizzas and the quantities that have been ordered:

Using Swift code, print the quantity of Rocky Road, and the quantity of Caramel Swirl. And then add a new order for 17 Banana Split pizzas.