How to Read from Standard Input in Golang
Reading from “standard input” is really useful if you are making a command-line application and require user input.
package main
import ( …Technical Articles
In-depth guides, insights, and best practices for modern software engineering
How to Install Golang on WSL/WSL2
If you need to install Golang on WSL under Windows 10 or higher, you can follow these few steps.
First remove any old versions lying around
sudo rm …How to Validate Phone Numbers in Java
The challenge
Write a function that accepts a string, and returns true if it is in the form of a phone number.
Assume that any integer from 0-9 in any …
How to Sort Array by Frequency in Java
The challenge
Sort elements in an array by decreasing frequency of elements. If two elements have the same frequency, sort them by increasing value. …
Read Article →How to Calculate String Rotation in Java
The challenge
Write a function that receives two strings and returns n, where n is equal to the number of characters we should shift the first string …
Read Article →Compare Strings by Sum of Chars in Java
The challenge
Compare two strings by comparing the sum of their values (ASCII character code).
- For comparing treat all letters as UpperCase
null …
How to Add Two Integers Without Arithmetic Operator in Java
The challenge
Given two integers a, b, find The sum of them, BUT You are not allowed to use the operators + and –
Notes
- The numbers (a,b) may be …
Counting Method VarArgs in Java
The challenge
Count how many arguments a method is called with.
Examples
args_count(1, 2, 3) -> 3
args_count(1, 2, 3, 10) -> 4
The solution in …
Read Article →How to Sum Consecutives in Java
The challenge
You are given a list/array which contains only integers (positive and negative). Your job is to sum only the numbers that are the same …
Read Article →Replacing Occurences of Words in Java
The challenge
You are given a string. You must replace any occurrence of the sequence coverage by covfefe, however, if you don’t find the word …
Convert String to LeetSpeak in Java
The challenge
Your task is to write a function toLeetSpeak that converts a regular english sentence to Leetspeak.
More about LeetSpeak You can read at …
Read Article →Ordered Count of Characters in Python
The challenge
Count the number of occurrences of each character and return it as a list of tuples in order of appearance. For empty output return an …
Read Article →Credit Card Issuer Checking in Java
The challenge
Given a credit card number we can determine who the issuer/vendor is with a few basic knowns.
Complete the function getIssuer() that …
Find Count of Most Frequent Item in an Array in Java
The challenge
Complete the function to find the count of the most frequent item of an array. You can assume that input is an array of integers. For an …
Read Article →Return Nth Smallest Element in Java
The challenge
Given an array/list [] of integers, Find the Nth smallest element in this array of integers
Notes
- Array/list size is at least 3 . …
What temperature does your Mac CPU idle at?
Sometimes you will find that your Mac is running very hot, and you may want to keep track of it over time to see if it’s persistent or only a …
Read Article →Split String into Parts in Java
The challenge
Split a given string into different strings of equal size.
Example:
Split the below string into other strings of size #3 …[Solved] ERROR 1030 (HY000): Got error 168 from storage engine
If you are getting the following error in MySQL:
ERROR 1030 (HY000): Got error 168 from storage engine
Then this usually means that your server has …
Read Article →Largest Pair Sum in Array in Python
The challenge
Given a sequence of numbers, find the largest pair sum in the sequence.
For example
[10, 14, 2, 23, 19] --> 42 (= 23 + 19)
[99, 2, …Alphabet Symmetry in Python
The challenge
Consider the word "abode". We can see that the letter a is in position 1 and b is in position 2. In the alphabet, a and b are …
Exes and Ohs in Java
The challenge
Check to see if a string has the same amount of ‘x’s and ‘o’s. The method must return a boolean and be case insensitive. The …
Read Article →Sum of Odd Cubed Numbers in Python
The challenge
Find the sum of the odd numbers within an array, after cubing the initial integers. The function should return None if any of the values …
Halving Sum in Python
The challenge
Given a positive integer n, calculate the following sum:
n + n/2 + n/4 + n/8 + ...
All elements of the sum are the results of integer …
Read Article →Convert a LinkedList to a String in Python
The challenge
Preloaded for you is a class, struct, or derived data type Node (depending on the language) used to construct linked lists in this …