freeCodeCamp/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/convert-seconds-to-compound-duration.english.md

title, id, challengeType

title	id	challengeType
Convert seconds to compound duration	596fd036dc1ab896c5db98b1	5

Description

Task:

Implement a function which:

takes a positive integer representing a duration in seconds as input (e.g., 100), and returns a string which shows the same duration decomposed into weeks, days, hours, minutes, and seconds as detailed below (e.g., "1 min, 40 sec").

Demonstrate that it passes the following three test-cases:

Test Cases

input number	output number
7259	2 hr, 59 sec
86400	1 d
6000000	9 wk, 6 d, 10 hr, 40 min

Details

The following five units should be used:

unit	suffix used in output	conversion
week	wk	1 week = 7 days
day	d	1 day = 24 hours
hour	hr	1 hour = 60 minutes
minute	min	1 minute = 60 seconds
second	sec

However, only include quantities with non-zero values in the output (e.g., return "1 d" and not "0 wk, 1 d, 0 hr, 0 min, 0 sec").Give larger units precedence over smaller ones as much as possible (e.g., return 2 min, 10 sec and not 1 min, 70 sec or 130 sec)Mimic the formatting shown in the test-cases (quantities sorted from largest unit to smallest and separated by comma+space; value and unit of each quantity separated by space).

---

Instructions

Tests

tests:
  - text: <code>convertSeconds</code> is a function.
    testString: assert(typeof convertSeconds === 'function', '<code>convertSeconds</code> is a function.');
  - text: <code>convertSeconds(7259)</code> should return <code>2 hr, 59 sec</code>.
    testString: assert.equal(convertSeconds(testCases[0]), results[0], '<code>convertSeconds(7259)</code> should return <code>2 hr, 59 sec</code>.');
  - text: <code>convertSeconds(86400)</code> should return <code>1 d</code>.
    testString: assert.equal(convertSeconds(testCases[1]), results[1], '<code>convertSeconds(86400)</code> should return <code>1 d</code>.');
  - text: <code>convertSeconds(6000000)</code> should return <code>9 wk, 6 d, 10 hr, 40 min</code>.
    testString: assert.equal(convertSeconds(testCases[2]), results[2], '<code>convertSeconds(6000000)</code> should return <code>9 wk, 6 d, 10 hr, 40 min</code>.');

Challenge Seed

function convertSeconds (sec) {
  // Good luck!
  return true;
}

After Test

const testCases = [7259, 86400, 6000000];
const results = ['2 hr, 59 sec', '1 d', '9 wk, 6 d, 10 hr, 40 min'];

Solution

function convertSeconds (sec) {
  const localNames = ['wk', 'd', 'hr', 'min', 'sec'];
  // compoundDuration :: [String] -> Int -> String
  const compoundDuration = (labels, intSeconds) =>
    weekParts(intSeconds)
    .map((v, i) => [v, labels[i]])
    .reduce((a, x) =>
      a.concat(x[0] ? [`${x[0]} ${x[1] || '?'}`] : []), []
    )
    .join(', ');

    // weekParts :: Int -> [Int]
  const weekParts = intSeconds => [0, 7, 24, 60, 60]
    .reduceRight((a, x) => {
      const r = a.rem;
      const mod = x !== 0 ? r % x : r;

      return {
        rem: (r - mod) / (x || 1),
        parts: [mod].concat(a.parts)
      };
    }, {
      rem: intSeconds,
      parts: []
    })
    .parts;

  return compoundDuration(localNames, sec);
}