34 lines
944 B
Markdown
34 lines
944 B
Markdown
---
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title: formatSeconds
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tags: date,math,string,intermediate
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---
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Returns the ISO format of the given number of seconds.
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- Divide `s` with the appropriate values to obtain the appropriate values for `hour`, `minute` and `second`.
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- Store the `sign` in a variable to prepend it to the result.
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- Use `Array.prototype.map()` in combination with `Array.prototype.floor()` and `String.prototype.padStart()` to stringify and format each segment.
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- Use `String.prototype.join(':')` to combine the values into a string.
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```js
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const formatSeconds = s => {
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const [hour, minute, second, sign] =
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s > 0
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? [s / 3600, (s / 60) % 60, s % 60, '']
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: [-s / 3600, (-s / 60) % 60, -s % 60, '-'];
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return (
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sign +
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[hour, minute, second]
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.map(v => `${Math.floor(v)}`.padStart(2, '0'))
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.join(':')
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);
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};
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```
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```js
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formatSeconds(200); // '00:03:20'
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formatSeconds(-200); // '-00:03:20'
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formatSeconds(99999); // '27:46:39'
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```
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