Scala & Spark-Master Big Data with Scala and Spark - Add and Remove Items from Maps

This video tutorial explains how to manage key-value pairs in a Scala map. It covers creating an empty map, adding and removing key-value pairs, and handling errors. The tutorial also highlights the importance of specifying data types and addresses common warnings. The next video will focus on iterating over map elements.

What is necessary to specify when creating an empty map in Scala without initial data?

• The size of the map

• The data types of the keys and values

• The default values for the map

• The name of the map

Which operator is used to add a new key-value pair to a map in Scala?

• Multiply (*)

• Plus equals (+=)

• Minus (-)

• Divide (/)

What common mistake might cause an error when adding key-value pairs to a map?

• Using a period instead of a comma

• Using a semicolon instead of a comma

• Using a space instead of a comma

• Using a colon instead of a comma

What operator is used to remove a key-value pair from a map in Scala?

• Minus (-)

• Multiply (*)

• Divide (/)

• Plus (+)

Why must keys in a Scala map be unique?

• To simplify the syntax

• To allow duplicate values

• To ensure fast access and manipulation

• To save memory space

What happens to the map when a key is removed?

• The map becomes empty

• The key and its associated value are deleted

• The map is reset to its initial state

• The map's size doubles

What is the result of printing a map after removing keys B and C?

• All keys and values will remain

• The map will be empty

• Only key A and its value will remain

• An error will occur