Exam 6: Working With Collections of Data

Which of the following methods can be used to generate a list of hash keys?

Unlike other types of Ruby objects, you cannot create a new array using the new method.

You can use the Hash class's hash method to generate a list of all of the keys stored in a hash.

An easy way to determine if a hash contains any key-value pairs is to execute the full? method.

An array's index begins at 0 and is incremented by one each time a new item it added.

Which of the following methods can be used to conditionally delete key-value pairs from a hash?

Ruby requires that the size of an array be specified when the array is defined.

In contrast to an array, the time it takes to retrieve data from a hash ____ as the hash grows in size.

Which of the following methods can be used to remove all of the items from an array?

An array is an indexed collection of key-value pairs.

The clear method can be used to remove all key-value entries from a hash.

The Hash class's delete method can be used to remove a key-value pair based on a supplied key.

As a hash grows in size it takes more and more time to process and retrieve hash key-item pairs.

Like most other programming languages, Ruby requires that an array be declared in advance of its use.

Which of the following methods can be used to retrieve the last array item?

The Array class's shift method can be used to delete the first item in an array.

Which of the following methods can be used to retrieves the first element stored in an array?

Unlike arrays, hashes are limited to storing only numeric and string data.

Which of the following methods can be used to retrieve an array item based on its index position?

The Array class's insert_at is the opposite of the delete_at method.