documentit/node_modules/pretty-bytes/pretty-bytes.js

47 lines
983 B
JavaScript
Raw Normal View History

2018-01-05 18:48:13 +00:00
/*!
pretty-bytes
Convert bytes to a human readable string: 1337 1.34 kB
https://github.com/sindresorhus/pretty-bytes
by Sindre Sorhus
MIT License
*/
(function () {
'use strict';
// Number.isNaN() polyfill
var isNaN = function (val) {
return val !== val;
};
var prettyBytes = function (num) {
if (typeof num !== 'number' || isNaN(num)) {
throw new TypeError('Expected a number');
}
var exponent;
var unit;
var neg = num < 0;
var units = ['B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
if (neg) {
num = -num;
}
if (num < 1) {
return (neg ? '-' : '') + num + ' B';
}
exponent = Math.min(Math.floor(Math.log(num) / Math.log(1000)), units.length - 1);
num = (num / Math.pow(1000, exponent)).toFixed(2) * 1;
unit = units[exponent];
return (neg ? '-' : '') + num + ' ' + unit;
};
if (typeof module !== 'undefined' && module.exports) {
module.exports = prettyBytes;
} else {
self.prettyBytes = prettyBytes;
}
})();