← Blog## JavaScript Katas: Seconds To Minutes And Hours

## Intro 🌐

### Today’s exercise

## Thinking about the Solution 💭

## Implementation (while) ⛑

### Result

## Implementation (floor) ⛑

### Result

## Playground ⚽

## Next Part ➡️

## Further Reading 📖

## Questions ❔

August, 2020

Problem solving is an important skill, for your career and your life in general.

That’s why I take interesting katas of all levels, customize them and explain how to solve them.

Today, another `7 kyu`

kata,
meaning we slightly increase the difficulty.

Source: Codewars

Write a function `toMinutesAndHours`

, that accepts one parameter: `seconds`

.

Given a number, e.g. `3601`

,
return a string describing how many hours and minutes comprise that many seconds, any remaining seconds left over are ignored,
e.g. `1 hour(s) and 0 minute(s)`

.

Input: a number.

Output: a string.

First, we need to understand the exercise! If we don’t understand it, we can’t solve it!.

I think I understand the exercise (= what I put into the function and what I want to get out of it).

Now, I need the specific steps to get from input to output.

I try to do this in small baby steps:

- Find out how many full minutes you get from the seconds
- Find out how many full hours you get from the minutes and remove them from minutes
- Return the string with hours and minutes

Example:

- Input:
`3601`

- Find out how many full minutes you get from the seconds:
`60`

- Find out how many full hours you get from the minutes and remove them from minutes:
`1`

hours and`0`

minutes - Output:
`"1 hour(s) and 0 minute(s)"`

✅

```
function toMinutesAndHours() {
const S_IN_M = 60;
const M_IN_H = 60;
let minutes = 0;
while (seconds - S_IN_M >= 0) {
minutes++;
seconds -= S_IN_M;
}
let hours = 0;
while (minutes - M_IN_H >= 0) {
hours++;
minutes -= M_IN_H;
}
return `${hours} hour(s) and ${minutes} minute(s)`;
}
```

```
console.log(toMinutesAndHours(3600));
// "1 hour(s) and 0 minute(s)" ✅
console.log(toMinutesAndHours(3601));
// "1 hour(s) and 0 minute(s)" ✅
```

```
function toMinutesAndHours() {
const hours = Math.floor(seconds / 3600);
const minutes = Math.floor((seconds % 3600) / 60);
return `${hours} hour(s) and ${minutes} minute(s)`;
}
```

```
console.log(toMinutesAndHours(3600));
// "1 hour(s) and 0 minute(s)" ✅
console.log(toMinutesAndHours(3601));
// "1 hour(s) and 0 minute(s)" ✅
```

You can play around with the code here

Great work!

We learned how to use `while`

, `Math.floor`

.

I hope you can use your new learnings to solve problems more easily!

Next time, we’ll solve another interesting kata. Stay tuned!

If I should solve a specific kata, shoot me a message here.

If you want to read my latest stuff, get in touch with me!

- How often do you do katas?
- Which implementation do you like more? Why?
- Any alternative solution?

Hi! I'm Michael 👋 I'm a Mentor & Educator & Senior Web Developer - I help you to reach your (career) goals.