DEV Community: Mikayil

undefined to string

Mikayil — Thu, 27 Jan 2022 10:14:45 +0000

Here I played with arrays and strings. And with this solution, I got one additional empty space:

function order(words){
  let newArr = [];

  words.split(" ").map(item => 
  newArr[Number(item.replace(/\D/g, ''))] = item);

  return words.length === 0 ? '' : newArr.join(' ');
}

The result was: 
console.log(order('is2 Thi1s T4est 3a')); 
>>" Thi1s is2 3a T4est"

It's more obvious with this example:

console.log([1, undefined, 3].join());

Which returns: 
>>"1,,3"

It should return and empty space but it looks like the empty space takes some space😅

So, I used filter() method:

function order(words){
  let newArr = [];

  words.split(" ").map(item => 
  newArr[Number(item.replace(/\D/g, ''))] = item);

  return words.length === 0 ? '' 
  : newArr.filter(e => e !== undefined).join(' ');
}

Simple nested JS Ternary

Mikayil — Tue, 25 Jan 2022 07:55:10 +0000

Sometimes it's really hard to grasp the idea of nested ternary in JavaScript, so I decided to present the simplest way of it, because I also struggled in the past when I just was too lazy to use if statements and wanted something handy and short. So this is it!

Suppose we have this task from codewars.com. Here what it says:

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 (February), is part of the first quarter; month 6 (June), is part of the second quarter; and month 11 (November), is part of the fourth quarter.

Let's implement it in ternary:
First we are checking whether month is less than 4:

const quarterOf = (month) => {
  return month < 4 ? 1   
}

Then like always in ternary we are adding a colon

const quarterOf = (month) => {
  return month < 4 ? 1 :

But instead of just adding the value in case of false we are adding the next condition which works just fine:

const quarterOf = (month) => {
  return month < 4 ? 1 : 
  month < 7 ? 2 :

And we can do it many times:

const quarterOf = (month) => {
  return month < 4 ? 1 : 
  month < 7 ? 2 : 
  month < 10 ? 3 : 
  4;  
}

And at the end we put the value like in else case.

isPalindrome?

Mikayil — Sat, 18 Dec 2021 17:07:45 +0000

Inspired by a video on YouTube, I decided to write a simple function to check whether a word is a palindrome or not.

const isPalindrome = palWord => 
palWord === palWord.split("").reverse().join("")

Flaw in CodeWars code?

Mikayil — Fri, 17 Dec 2021 07:59:40 +0000

I had this challenge:

Given 2 strings, a and b, return a string of the form short+long+short, with the shorter string on the outside and the longer string on the inside. The strings will not be the same length, but they may be empty ( zero length ).
Hint for R users:
The length of string is not always the same as the number of characters
For example: (Input1, Input2) --> output
("1", "22") --> "1221"
("22", "1") --> "1221"

And my solution was:
const solution = (a, b) => {return a.length < b.length ? a+b+a : b+a+b}
Then I found this among accepted solutions:
const solution = (a, b) => a < b ? a + b + a : b + a + b;
Which is wrong in when you pass "true" or "false" or both of them:
solution("u","false") -> "falseufalse"
solution("true","false") -> "falsetruefalse"
solution("true","sample") -> "sampletruesample"

I am doubtful now about the platform. Maybe it also accepted my solutions when they were wrong...

JS warrior

Mikayil — Fri, 17 Dec 2021 07:39:52 +0000

Recently started solving challenges on codewars on a daily basis. And you know, it helps! Following mentors lead during any course wouldn't give you the deep understanding which a real challenge gives you. I started from 8th rank, and gradually will increase the level.