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24 lines
581 B
24 lines
581 B
'use strict'; |
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const UNITS = ['B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']; |
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module.exports = num => { |
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if (!Number.isFinite(num)) { |
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throw new TypeError(`Expected a finite number, got ${typeof num}: ${num}`); |
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} |
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const neg = num < 0; |
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if (neg) { |
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num = -num; |
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} |
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if (num < 1) { |
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return (neg ? '-' : '') + num + ' B'; |
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} |
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const exponent = Math.min(Math.floor(Math.log(num) / Math.log(1000)), UNITS.length - 1); |
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const numStr = Number((num / Math.pow(1000, exponent)).toPrecision(3)); |
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const unit = UNITS[exponent]; |
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return (neg ? '-' : '') + numStr + ' ' + unit; |
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};
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