JavaScript Kata #30: Beginner Series #2 Clock

By YayoDrayber | Learn To Code With Me | 11 Sep 2022

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 #30

DESCRIPTION:

Clock shows h hours, m minutes and s seconds after midnight.

Your task is to write a function which returns the time since midnight in milliseconds.

Example:

h = 0
m = 1
s = 1

result = 61000

Input constraints:

0 <= h <= 23
0 <= m <= 59
0 <= s <= 59

Starting code:

function past(h, m, s){
  //#Happy Coding! ^_^
}

My attempt:

const past = (h, m, s) => (((h*3600)+(m*60)+s)*1000)

Rank #1 in 'Best Practice':

function past(h, m, s){
  return ((h*3600)+(m*60)+s)*1000;
}

Rank #2:

const past = (h,m,s) => 1000 * (3600 * h + 60 * m + s);

Rank #3:

function past(h, m, s){
  var miliseconds = 0;
  miliseconds = miliseconds + s * 1000;
  miliseconds = miliseconds + m * 60000;
  miliseconds = miliseconds + h * 3600000;
  return miliseconds;
}

Rank #4:

function past(h, m, s){
  var hours = h * 60 * 60 * 1000;
  var minutes = m * 60 * 1000;
  var seconds = s * 1000;
  
  return hours + minutes + seconds;
}

Rank #5 with the use of the Date object and .setHours() method:

function past(h, m, s){
  const setTime = new Date().setHours(h, m, s);
  const midnight = new Date().setHours(0, 0, 0);
  
  return Math.round(setTime - midnight);
}

That's it for Kata #30, 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