Katas | TDD Kata- an exercise in coding | Unit Testing library

I solve on codewars katas and one of them told

Your goal in this kata is to implement a difference function, which subtracts one list from another and returns the result.

Here are two implementations. One of then requires Clone traits and another does not. Why second (shortest solution) does NOT need Clone trait?

First:

Currently trying to complete the persistent bugger kata in code wars.

I need to return the number of times the input has to be multiplied until it is reduced to a single number (full task instructions below).

Everything appears to work apart from the count. when I console log, the number of times it logs and runs is correct, but instead of incrementing such as 1,2,3 it will be something like 2,2,4.

So instead of returning 3, it returns 4.

I try to not ask for help with katas, but this time I am completely at a loss as to why the count is firstly skipping numbers and also not incrementing.

Task:

Write a function, persistence, that takes in a positive parameter num and returns its multiplicative persistence, which is the number of times you must multiply the digits in num until you reach a single digit.

For example:

...

So I had this script that was functioning alright and then stoped working. The item doesn't get clicked when I run the script and appears this error.

I am very new to C# programming (2 days in so far), after learning intermediate python and doing a few small projects, I am trying to learn C#

But because me knowing python, I am finding C# a little confusing, arrays always throw me off, while in python initializing a list is as easy as declaring a variable with empty lists x = [], C#'s way of declaring arrays is confusing.

My issue is, I encountered an error, which I did google but found nothing (there was one question similar to mine but no one had answered on it)

I was on a site called https://codewars.com/ and was solving Katas (problems) [lvl 7 (beginner)]

The question stated that for any input integer n, I have to return an array with a factor of the number n where n > 1

In python, the code will be like this:

I'm a beginner and attempting some katas on codewars. I wonder if anyone can help me out and explain what is happening with this code. At this point I'm not looking for a solution for the whole exercise, I'd just like to understand why the const cumulativeSum is working differently for the two different arrays.

I'm creating two cumulative arrays, the code works for the first one (cumulativeProfit with the starting array peopleInLine) and everything comes out correctly but when I use it for the second one (cumulativeOutgoings with the starting array changeRequired) the figures are wrong.

My peopleInLine array is: [100, 25, 50, 100, 25, 25, 25, 100, 25, 50, 25, 100, 25, 25, 50, 100, 25, 25, 50, 100]

I have to admit that I don't really understand how const cumulativeSum = (sum => value => sum += value)(0) works. I found it after searching on stack overflow!

Very grateful for any assistance.

I try to create search feature using $text and $search in mongoose but it stuck when the query meet mongodb english stop words. I try to change my default_language to none to ignore the stop words list but then I realized that I cannot change the default_language.

I was wondering the way my mongoose always create index with default_language: english, even I directly use default_language: 'none'.

Here is my code:

I'm fairly new to Coq, and was doing some Katas on CodeWars for fun and learning.

I'm stuck with one of them and want to hear some ideas from you.

So, I have:

I've been solving katas on codewars and I stumbled upon a general code problem that I can't seem to find an answer to.

This is my code:

I’m doing a bunch of projects in CLion, each of which has two pieces of code: Solution and TestConductor. The Solution is the solution to a code kata, and the TestConductor uses Catch2 to run the tests (which are stored in input_n.txt and output_n.txt files). TestConductor has to call Solution, of course. Solution changes for each project (representing a different kata), but TestConductor only changes in that it needs to know what the input.txt and output.txt files are called (their names can vary slightly), and how to call Solution (whose name is different for different katas, like it could be called PermutationFinder or PairSorter or whatever).

I’ve basically been copy-pasting the TestConductor code into each of my projects, which seems smelly to me. What would be the philosophically correct way to work with this? Make TestConductor into a library of some kind? (Still learning how to make and use those.)

TestConductor code is here if you want some concreteness. (45 lines)

I guess more generally, what do you do when the code which you want to abstract, and reuse over multiple projects, isn’t called by the code which changes, but rather calls it?

I'm gather this is a rather common situation that has a simple solution. Sorry if this is a repeat question; I didn't know what search terms I could use.