Creating a Multiplication Table for a Number in Golang
The challenge
Your goal is to return multiplication table for number that is always an integer from 1 to 10.
For example, a multiplication table …
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In-depth guides, insights, and best practices for modern software engineering
How to Remove Duplicates in an Array in Golang
The challenge
Remove the left-most duplicates from a list of integers and return the result.
// Remove the 3's at indices 0 and 3
// followed by …How to Dry Potatoes in Golang
The challenge
All we eat is water and dry matter.
John bought potatoes: their weight is 100 kilograms. Potatoes contain water and dry matter.
The …
Read Article →How to Reverse or Rotate in Golang
The challenge
The input is a string str of digits. Cut the string into chunks (a chunk here is a substring of the initial string) of size sz (ignore …
How to use Coroutines in Kotlin
Coroutines are a way to handle multithreading in Kotlin, read more about it from the official docs: …
Read Article →The Pair Type in Kotlin
val pair: Pair<String, Int> = "myKey" to 2
What is a Pair Type?
A utility class when you want to return 2 values that are not related …
Read Article →Get which Quarter of the Year in Golang
The challenge
Given a month as an integer from 1 to 12, return to which quarter of the year it belongs as an integer number.
For example: month 2 …
Read Article →How to Sum The Strings in Python
The challenge
Create a function that takes 2 nonnegative integers in form of a string as an input, and outputs the sum (also as a string):
Example: ( …
Read Article →Fixing: ImmutableService requires getRowNodeId() callback to be implemented, your row data need IDs
If you have gotten this error before, then you have been trying to implement a rowData mapping onto Ag-Grid.. and failed!
ImmutableService requires …
How to Undo the most recent local commits in Git
If you have accidentally committed the wrong files into Git, but haven’t yet pushed it to the server, you can recover, or undo your commit as …
Read Article →Deconstruction in Kotlin
There are times when you need to extract an object into a number of variables.
Let’s take the example below:
val (id, name, position, …Playing with passphrases in Python
The challenge
Everyone knows passphrases. One can choose passphrases from poems, songs, movies names and so on but frequently they can be guessed due …
Read Article →What is a Unit in Kotlin?
Unit corresponds to the void keyword in Java.
What is a Unit in Kotlin?
If you have a function that does not return a value, you can return a Unit …
How to declare a Function in Kotlin?
Functions are reusable pieces of code, often called Blocks, that as the name suggests, act as building blocks to piece together a program.
Each …
Read Article →The differences between Val and Var in Kotlin
Among all the many keywords that Kotlin comes with, there exists val and var. What are they used for? What are the differences, and why would you use …
Automatically Resize All Columns to Fit in Ag-Grid
If you have an Ag-Grid, and want to automatically resize all the columns to fit the width of the viewport, you can use this hack.
The implementation …
Read Article →How to Get All Rows in Ag-Grid
The easiest way to get the content of all rows’ data, back into a Javascript/Typescript array, is as follows.
Simply create a blank array, then …
Read Article →Find the Max Area of an Island in Python
The challenge
You are given an m x n binary matrix grid. An island is a group of 1‘s (representing land) connected 4-directionally (horizontal or …
Using Apache POI to Get or Create a Sheet in Excel using Java
Apache POI provides a mechanism to work with Excel documents.
However, it has a missing feature when you want to only create a new sheet if one with …
Read Article →A Simplistic TCP Finite State Machine (FSM) in Python
The challenge
Automatons, or Finite State Machines (FSM), are extremely useful to programmers when it comes to software design. You will be given a …
Read Article →How to Resolve Scaling Squared Strings in Java
The challenge
You are given a string of n lines, each substring being n characters long. For example:
s = "abcd\nefgh\nijkl\nmnop"
We will …
Read Article →How to Build a Square in Python
The challenge
I will give you an integer. Give me back a shape that is as long and wide as the integer. The integer will be a whole number between 1 …
Read Article →Check if String EndsWith in Python
The challenge
Complete the solution so that it returns true if the first argument(string) passed in ends with the 2nd argument (also a string). …
Read Article →How to add a Git Submodule to an existing codebase
Git submodules are a way of including another repository’s code into an existing codebase, without associating it’s code or tracking …
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