How to create ArrayList from Array in Java
The problem
If you have a traditional array, that looks something like the following:
A[] array = {new A(1), new A(2), new A(3)};
And you would like …
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In-depth guides, insights, and best practices for modern software engineering
How to Generate a Random AlphNumeric String in Linux/MacOS
If you need to generate a random AlphaNumeric string from the Linux/MacOS Command-Line, then you can use the following script:
dd if=/dev/random bs=8 …How to check if a string is empty in Go
If you need to check if a string is empty in Go, then there are two possible ways to immediately verify this:
Option 1 – Compare the length:
if len(s) …How to read a file line by line in Go
If you need to read a file line by line in Go, then you can use the bufio package as follows:
package main
import (
"bufio" …Floating-point Approximation in Golang
The challenge
Consider the function
f: x -> sqrt(1 + x) - 1 at x = 1e-15.
We get: f(x) = 4.44089209850062616e-16
This function involves the …
Read Article →All the Ways to Divide an Array in Two in Golang
The challenge
Write a function partlist that gives all the ways to divide an array of at least two elements into two non-empty parts.
- Each two non …
How to check if a file exists in Go
If you need to check if a file exists using Go, then you can use one of the following methods, depending on the version of Go you may be using.
If you …
Read Article →How to convert a string value to an int in Go
If you need to convert a string to an int in Go, then you should use the strconv.Atoi function:
package main
import (
"strconv" …How to convert an int value to string in Go
If you need to convert an int to a string in Go, then you should use the strconv.Itoa function:
package main
import (
"strconv" …How to Efficiently Concatenate Strings in Go
If you are using a version of Go >= 1.10, then you should be using the newer strings.Builder pattern as follows:
package main
import ( …How to check if a map contains a key in Go
If you have a map in Go and want to only perform an action if it contains a certain key, then you can do so easily:
if val, ok := …How to Remove all Vowels from a String in Java
The challenge
Remove all vowels from the string.
Vowels:
a e i o u
A E I O U
The solution in Java code
Option 1:
public class VowelRemoval {
public …How to Loop Forever in Golang
If you need to loop forever, or infinitely, in your Go code, then you have 2 options:
Option 1:
for {
// your code here
}
Option 2:
for true {
// …Understanding For Loops in Golang
In Golang a for loop is a way to loop through an iterable.
The most basic For Loop
i := 0
for i <= 3 {
i = i + 1
}
A classic For Loop
for i := 7; …[Solved] go mod init: modules disabled by GO111MODULE=off
You’ve probably just tried to initialise a new Go module, and received the following error:
go mod init: modules disabled by GO111MODULE=off; …
How to UpperCase the start of each Word in a String in Golang
The challenge
The task is to take a string of lower-cased words and convert the sentence to upper-case the first letter/character of each word …
Read Article →How to Solve Max-Min Arrays in Java
The challenge
You are given an array of unique elements, and your task is to rearrange the values so that the first max value is followed by the first …
Read Article →How to Find the Smallest Integer in the Array in Golang
The challenge
Given an array of integers your solution should find the smallest integer.
For example:
- Given
[34, 15, 88, 2]your solution will return …
How to do Basic Encryption in Java
The challenge
The most basic encryption method is to map a char to another char by a certain math rule. Because every char has an ASCII value, we can …
Read Article →Forming Unique Array Combinations in Golang
The challenge
You are given an array of arrays and your task will be to return the number of unique arrays that can be formed by picking exactly one …
Read Article →How to Check if String is a Palindrome in Python
The challenge
Write a function that checks if a given string (case insensitive) is a palindrome.
The solution in Python
Option 1:
def …How to Find the Squares in Java
The challenge
Complete the function that takes an odd integer (0 < n < 1000000) which is the difference between two consecutive perfect squares, …
How to Get Longest Word in Sentence in Java
The challenge
When given a string of space-separated words, return the word with the longest length.
If there are multiple words with the longest …
Read Article →How to Sum all the Integers in a String in Golang
The challenge
Implement a function that calculates the sum of the integers inside a string. For example, in the string …
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