How to perform Array Element Parity in Golang
The challenge
You will be given an array of integers whose elements have both a negative and a positive value, except for one integer that is either …
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In-depth guides, insights, and best practices for modern software engineering
How to Reverse Letters in Kotlin
The challenge
Given a string str, reverse it omitting all non-alphabetic characters.
For str = "krishan", the output should be …
How to Get the ASCII Value of Character in Kotlin
The challenge
Get the ASCII value of a character.
The solution in Kotlin
Option 1:
val getAscii = Char::toInt
Option 2:
fun getAscii(c: Char) = c.code …How to update each dependency in package.json to the latest version
You have 2 options:
Option 1 – Recommended (Using npx)
npx npm-check-updates -u
npm install
Option 2 – Older way (Using npm globally)
npm i -g …How to Convert IPv4 to int32 in Javascript
The challenge
Take the following IPv4 address: 128.32.10.1 This address has 4 octets where each octet is a single byte (or 8 bits).
- 1st octet 128 has …
How to Solve the Grouped by Commas Challenge in Javascript
The challenge
Finish the solution so that it takes an input n (integer) and returns a string that is the decimal representation of the number grouped …
How to Save sed Output Directly to a File
You have 3 options here:
Option 1: use tee with sed
sed 's/Hello/Hi/g' file-name | tee file
Option 2: use > with sed
sed …How to Convert BigNumber to Int/Number in Ethers/Web3
If you have a BigNumber when using web3, then you can convert this to a regular Javascript Number using the ethers library as follows: …
How to Create a Pyramid Array in Javascript
The challenge
Write a function that when given a number >= 0, returns an Array of ascending length subarrays.
pyramid(0) => [ ]
pyramid(1) => …How to Create a Reverse Polish Notation Calculator in Javascript
The challenge
Your job is to create a calculator which evaluates expressions in Reverse Polish notation.
For example expression 5 1 2 + 4 * + 3 - …
How to declare a global variable in React?
If you need to declare a global variable in React, then you can do the following:
Create a file called config.js
module.exports = global.config = { …How to Find the Missing Term in an Arithmetic Progression in Javascript
The challenge
An Arithmetic Progression is defined as one in which there is a constant difference between the consecutive terms of a given series of …
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