Objects - Arrays

Question 1

What is an array?

Answer 1

A numbered list of items.

Question 2

What is an index?

Answer 2

It is an item’s number in the array.

Question 3

What will the sixth item on a list’s index be?

Answer 3

5. Remember that we use 0 based counting in OOP.

Question 4

How do you create an array?

Answer 4

1 - specify the type of data that you want to store in the array (string, int etc)

#2 follow the type declaration with square brackets : 
string[]

Question 5

What will be returned if you dont tell the array what you want the items to contain?

Answer 5

null in each indices that hasn’t been assigned a value.

Question 6

How do you assign values to specific indices?

Answer 6

arrayName[index # you want to assign] = “Value you want to give it.”;

favThings [0] = “First item.”; will assign “First item.” to the first indices.

Question 7

How do you shorten the syntax of array creation?

Answer 7

You can shorten it to this:

string[] nameOfArray = {“first”, “second”, “third”};

Question 8

How can you find out the length of an array?

Answer 8

nameOfArray.Length

Question 9

What is a turnairy if statement?

Answer 9

Its a bit of syntactic sugar that combines an if/else into one statement:

return(pathStep , _path.Length) ? _path[pathStep] : null;

put a question mark after the conditions, separate the if and else with a :