40 lines
1.3 KiB
Markdown
40 lines
1.3 KiB
Markdown
### prettyBytes
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Converts a number in bytes to a human-readable string.
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Use an array dictionary of units to be accessed based on the exponent.
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Use `Number.toPrecision()` to truncate the number to a certain number of digits.
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Return the prettified string by building it up, taking into account the supplied options and whether it is
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negative or not.
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```js
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const prettyBytes = (num, precision = 3, addSpace = true) {
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const UNITS = ['B','KB','MB','GB','TB','PB','EB','ZB','YB'];
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if (num < 1) return (num < 0 ? '-' : '') + num + ' B';
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const exponent = Math.min(Math.floor(Math.log10(num < 0 ? -num : num) / 3), UNITS.length - 1);
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const n = Number(((num < 0 ? -num : num) / 1000 ** exponent).toPrecision(options.precision));
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return (
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(num < 0 ? '-' : '') +
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n +
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(options.addSpace ? ' ' : '') + UNITS[exponent]
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);
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};
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```
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```js
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/*
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Default options: {
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precision: 3, // number of digits
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addSpace: true, // add a space between the unit and number?
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wholeWord: false // use the whole word or two letters?
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}
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*/
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prettyBytes(1000); // 1 KB
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prettyBytes(123456789); // 123 MB
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prettyBytes(-50); // -50 B
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prettyBytes(27145424323.5821); // 27.1 GB
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prettyBytes(27145424323.5821, { precision: 5 }); // 27.145 GB
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prettyBytes(5500, { wholeWord: true }); // 5.5 Kilobytes
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prettyBytes(5500, { addSpace: false }); // 5.5KB
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```
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