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Update prettyBytes.md

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Angelos Chalaris
2018-01-01 20:08:31 +02:00
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parent df9b8140e2
commit ef1bf2fa94
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snippets/prettyBytes.md
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@ -4,20 +4,17 @@ Converts a number in bytes to a human-readable string.
Use an array dictionary of units to be accessed based on the exponent.
Use `Number.toPrecision()` to truncate the number to a certain number of digits.
Return the prettified string by building it up, taking into account the supplied options and whether it is
negative or not.
Return the prettified string by building it up, taking into account the supplied options and whether it is negative or not.
Omit the second argument, `precision`, to use a default precision of `3` digits.
Omit the third argument, `addSpace`, to add space between the number and unit by default.
```js
const prettyBytes = (num, precision = 3, addSpace = true) => {
const UNITS = ['B','KB','MB','GB','TB','PB','EB','ZB','YB'];
if (Math.abs(num) < 1) return num + ' B';
if (Math.abs(num) < 1) return num + (addSpace ? ' ' : '') + UNITS[0];
const exponent = Math.min(Math.floor(Math.log10(num < 0 ? -num : num) / 3), UNITS.length - 1);
const n = Number(((num < 0 ? -num : num) / 1000 ** exponent).toPrecision(precision));
return (
(num < 0 ? '-' : '') +
n +
(addSpace ? ' ' : '') + UNITS[exponent]
);
return ((num < 0 ? '-' : '') + n + (addSpace ? ' ' : '') + UNITS[exponent]);
};
```