Adding and removing items from a list in Python

Adding and removing items from a list in Python problem You are using a list in your Python program and wish to add and remove items. In this post we will see built-in functions that allow us to manipulate the items in the list. SOLUTION Adding an item Let’s suppose we have a list named […]

Using a set in Python

Using a set in python problem You’re learning Python and you wish to use a Set data structure. A set in programming origins from the mathematical notion of a set. This means, they’re only distinct values, no duplicates. SOLUTION Python comes with a built-in Set data structure. In order to use it we need to […]

Using a Queue in Java

Using a Queue in java problem You wish to use the Queue data structure in Java. It is a FIFO – First In First Out data structure meaning the first item that is added is firstly retrieved. Analogous to a queue of people standing to get a ticket at the cinema. SOLUTION – LinkedList Java […]

Using a Stack in Java

Using a Stack data structure in Java problem You wish to use the Stack in Java. This data structure “stacks” data elements one on top of the other hence its name. Similar to the analogy of plates when we stack one on top of the other. It is also known as a LIFO (Last In […]

Filtering out the Optional.empty from list

Filtering out the Optional.empty problem You have a collection in Java with Optionals and some of them are empty. You wish to remove the empty ones. SOLUTION Stream. If you use Java 8 and beyond, you can use the stream API. Let’s suppose that you have the following list of Optionals: Optionals.java List objectList = […]