If you missed the introductory post, it's here. For a list of previously solved katas, please refer to the bottom of this page.
If this is your first time seeing my post, please note - these katas are probably randomly assigned per user so please don't go into Codewars thinking we will have exactly the same user experience, I am just posting these in the order that I got them.
Kata #14
DESCRIPTION:
You are going to be given a word. Your job is to return the middle character of the word. If the word's length is odd, return the middle character. If the word's length is even, return the middle 2 characters.
#Examples:
Kata.getMiddle("test") should return "es"
Kata.getMiddle("testing") should return "t"
Kata.getMiddle("middle") should return "dd"
Kata.getMiddle("A") should return "A"
#Input
A word (string) of length 0 < str < 1000 (In javascript you may get slightly more than 1000 in some test cases due to an error in the test cases). You do not need to test for this. This is only here to tell you that you do not need to worry about your solution timing out.
#Output
The middle character(s) of the word represented as a string.
Starting code:
function getMiddle(s)
{
//Code goes here!
}My attempt:
function getMiddle(s){
let sMid = 0.0
if(s.length % 2 == 0){
sMid = (s.length/2)
return s.substring(sMid-1,sMid+1)
} else{
sMid = (s.length/2) - 0.5
return s.substr(sMid,1)
}
}Rank #1 'Best Practice':
function getMiddle(s)
{
return s.substr(Math.ceil(s.length / 2 - 1), s.length % 2 === 0 ? 2 : 1);
}Should've known there was an easier way to round up with Math.ceil() instead of what I did.
Didn't want to use .slice() on this problem but rank #2 demonstrates how to do it just in case:
function getMiddle(s) {
var middle = s.length / 2;
return (s.length % 2)
? s.charAt(Math.floor(middle))
: s.slice(middle - 1, middle + 1);
}Rank #3 with a simpler .slice() usage:
function getMiddle(s)
{
return s.slice((s.length-1)/2, s.length/2+1);
}Rank #4 with Math.floor()'s round down:
function getMiddle(s)
{
let middle = Math.floor(s.length/2);
return s.length % 2 === 0
? s.slice(middle-1, middle+1)
: s.slice(middle, middle+1);
}That's it for Kata #14, stay tuned for more katas to be solved!
Link to Kata #1: Square(n) Sum
Link to Kata #2: Convert a Number to a String
Link to Kata #3: DNA to RNA Conversion
Link to Kata #4: Remove First and Last Character
Link to Kata #5: MakeUpperCase
Link to Kata #6: Total amount of points
Link to Kata #7: A Needle in the Haystack
Link to Kata #8: Sum of positive
Link to Kata #9: Basic Mathematical Operations
Link to Kata #10: Beginner - Reduce but Grow
Link to Kata #11: Square Every Digit
