130 lines
3.5 KiB
Markdown
130 lines
3.5 KiB
Markdown
---
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id: 596fd036dc1ab896c5db98b1
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title: Convert seconds to compound duration
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challengeType: 5
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forumTopicId: 302236
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dashedName: convert-seconds-to-compound-duration
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---
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# --description--
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Implement a function which:
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<ul>
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<li>takes a positive integer representing a duration in seconds as input (e.g., <code>100</code>), and</li>
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<li>returns a string which shows the same duration decomposed into weeks, days, hours, minutes, and seconds as detailed below (e.g., <code>1 min, 40 sec</code>).</li>
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</ul>
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Demonstrate that it passes the following three test-cases:
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<div style='font-size:115%; font-weight: bold;'>Test Cases</div>
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| Input number | Output number |
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| ------------ | ------------------------- |
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| 7259 | <code>2 hr, 59 sec</code> |
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| 86400 | <code>1 d</code> |
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| 6000000 | <code>9 wk, 6 d, 10 hr, 40 min</code> |
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<div style="font-size:115%; font-weight: bold;">Details</div>
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<ul>
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<li>
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The following five units should be used:
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| Unit | Suffix used in Output | Conversion |
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| ------ | --------------------- | --------------------- |
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| week |!!crwdBlockTags_18_sgaTkcolBdwrc!! | 1 week = 7 days |
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| day |!!crwdBlockTags_19_sgaTkcolBdwrc!! | 1 day = 24 hours |
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| hour |!!crwdBlockTags_20_sgaTkcolBdwrc!! | 1 hour = 60 minutes |
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| minute |!!crwdBlockTags_21_sgaTkcolBdwrc!! | 1 minute = 60 seconds |
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| second |!!crwdBlockTags_22_sgaTkcolBdwrc!! | --- |
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</li>
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<li>
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However, <strong>only</strong> include quantities with non-zero values in the output (e.g., return <code>1 d</code> and not <code>0 wk, 1 d, 0 hr, 0 min, 0 sec</code>).
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</li>
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<li>
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Give larger units precedence over smaller ones as much as possible (e.g., return <code>2 min, 10 sec</code> and not <code>1 min, 70 sec</code> or <code>130 sec</code>).
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</li>
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<li>
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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).
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</li>
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</ul>
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# --hints--
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`convertSeconds` should be a function.
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```js
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assert(typeof convertSeconds === 'function');
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```
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`convertSeconds(7259)` should return `2 hr, 59 sec`.
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```js
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assert.equal(convertSeconds(testCases[0]), results[0]);
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```
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`convertSeconds(86400)` should return `1 d`.
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```js
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assert.equal(convertSeconds(testCases[1]), results[1]);
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```
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`convertSeconds(6000000)` should return `9 wk, 6 d, 10 hr, 40 min`.
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```js
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assert.equal(convertSeconds(testCases[2]), results[2]);
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```
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# --seed--
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## --after-user-code--
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```js
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const testCases = [7259, 86400, 6000000];
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const results = ['2 hr, 59 sec', '1 d', '9 wk, 6 d, 10 hr, 40 min'];
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```
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## --seed-contents--
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```js
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function convertSeconds(sec) {
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return true;
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}
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```
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# --solutions--
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```js
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function convertSeconds(sec) {
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const localNames = ['wk', 'd', 'hr', 'min', 'sec'];
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// compoundDuration :: [String] -> Int -> String
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const compoundDuration = (labels, intSeconds) =>
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weekParts(intSeconds)
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.map((v, i) => [v, labels[i]])
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.reduce((a, x) =>
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a.concat(x[0] ? [`${x[0]} ${x[1] || '?'}`] : []), []
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)
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.join(', ');
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// weekParts :: Int -> [Int]
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const weekParts = intSeconds => [0, 7, 24, 60, 60]
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.reduceRight((a, x) => {
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const r = a.rem;
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const mod = x !== 0 ? r % x : r;
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return {
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rem: (r - mod) / (x || 1),
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parts: [mod].concat(a.parts)
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};
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}, {
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rem: intSeconds,
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parts: []
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})
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.parts;
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return compoundDuration(localNames, sec);
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}
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```
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