Exam 6: Working With Collections of Data

The reverse method can be used to generate a list of array items in the opposite order that they are actually stored.

Values stored within an array are referenced based on their index position within the array.

As arrays grow in size it takes more and more time to process and retrieve array items.

What happens if you accidentally assign a new value to a hash using a key that already exists?

The Array class's pop method is used to delete an item from the end of an array.

Which of the following methods can be used to retrieve a series of items from an array?

Which of the following methods allows you to delete an array item based on its value?

Which of the following methods can be used to determine if an array contains any items.

Which of the following methods automatically iterates once for each item stored in an array?

The inspect method can be used to convert the contents of a hash into an array and vice versa.

Which of the following statements is not valid?

Taking the output of one method and using it as input for a subsequent method is accomplished through a process referred to as ____ the two methods together.

Ruby permits the specification of a negative integer value when referring to array values. An index value of -2 would refer to which item in an array?

Every item stored within a hash is assigned both a key as well as a unique index position.

What is a collection of key-value pairs called?

Ruby permits the use of both real number and integers as index position values.

Ruby arrays start with an index position of ____?

The following statement is an example of chaining methods together. fruit.sort.reverse.inspect

Although the each loop can be used to process the content of an array, you are generally better off using a while or until loop.

One way of creating a new hash is to take the contents of two existing hashes and combine them together using the _______________ method.