data structures

Articles: 24

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Article

Graphs in Python: Depth-First Search (DFS) Algorithm

Originating from mathematics, graphs are now widely used data structures in Computer Science. One of the first problems we encounter when constructing any algorithm regarding Graph processing or traversal, is how we represent the graph and then, how to traverse that representation. Graph traversal is not a trivial problem, and...

Anđela Niketić

Aug 16, 2021

Article

Python: Check if Variable is a Dictionary

Variables act as a container to store data. A developer can use type hints when creating variables or passing arguments, however, that's an optional feature in Python, and many codebases, old and new, are yet to have them. It's more common for a variable in Python to have no information...

Naazneen Jatu

Feb 16, 2021·4 min read

Article

Python: How to Remove a Key from a Dictionary

In this article, we'll take a look at how to remove keys from Python dictionaries. This can be done with the pop() function, the del keyword, and with dict comprehensions. Remove a Key Using pop(key,d) The pop(key, d) function removes a key from a dictionary and returns...

Sathiya Sarathi Gunasekaran

Feb 12, 2021·5 min read

Article

Python: How to Add Key to a Dictionary

A dictionary in Python is a collection of items that store data as key-value pairs. We can access and manipulate dictionary items based on their key. Dictionaries are mutable and allow us to add new items to them. The quickest way to add a single item to a dictionary is...

Naazneen Jatu

Feb 11, 2021·4 min read

Article

JavaScript: Check if Object is Array

Working with arrays in JavaScript is a common activity. Sometimes we get a variable in JavaScript that we need to be an array, but we aren't sure that it is. Non-primitive data types in JavaScripts are all objects (functions have their own type, but they too are objects). As a...

Guest Contributor

Dec 22, 2020·4 min read

Article

How to Merge Two Dictionaries in Python

It's not uncommon to have two dictionaries in Python which you'd like to combine. In this article, we will take a look at various ways on how to merge two dictionaries in Python. Some solutions are not available to all Python versions, so we will examine ways to merge for...

Sathiya Sarathi Gunasekaran

Dec 09, 2020·4 min read

Article

JavaScript: How to Insert Elements into a Specific Index of an Array

An array is a linear data structure and arguably one of the most popular data structures used in Computer Science. Modifying an array is a commonly encountered operation. Here, we will discuss how to add an element in any position of an array in JavaScript. An element can be added...

Guest Contributor

Dec 08, 2020·5 min read

Article

Python with Pandas: DataFrame Tutorial with Examples

Pandas is an open-source Python library for data analysis. It is designed for efficient and intuitive handling and processing of structured data. The two main data structures in Pandas are Series and DataFrame. Series are essentially one-dimensional labeled arrays of any type of data, while DataFrames are two-dimensional, with potentially...

Olivera Popović

Aug 28, 2020·11 min read

Article

Graphs in Java: Dijkstra's Algorithm

Graphs are a convenient way to store certain types of data. The concept was ported from mathematics and appropriated for the needs of computer science. Due to the fact that many things can be represented as graphs, graph traversal has become a common task, especially used in data science and...

Olivera Popović

Sep 27, 2019·22 min read