Ross
64 lines
1.7 KiB
JavaScript
64 lines
1.7 KiB
JavaScript
/**
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* Function to randomise an array order
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* @param {array} array
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*/
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export function shuffleArray(array) {
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var currentIndex = array.length,
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temporaryValue,
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randomIndex;
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// While there remain elements to shuffle...
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while (0 !== currentIndex) {
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// Pick a remaining element...
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randomIndex = Math.floor(Math.random() * currentIndex);
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currentIndex -= 1;
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// And swap it with the current element.
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temporaryValue = array[currentIndex];
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array[currentIndex] = array[randomIndex];
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array[randomIndex] = temporaryValue;
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}
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return array;
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}
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export function formatBytes(bytes, decimals = 2) {
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if (bytes === 0) return "0 Bytes";
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const k = 1024;
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const dm = decimals < 0 ? 0 : decimals;
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const sizes = ["Bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"];
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const i = Math.floor(Math.log(bytes) / Math.log(k));
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return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + " " + sizes[i];
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}
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/**
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* Format bytes as human-readable text.
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*
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* @param bytes Number of bytes.
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* @param si True to use metric (SI) units, aka powers of 1000. False to use
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* binary (IEC), aka powers of 1024.
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* @param dp Number of decimal places to display.
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*
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* @return Formatted string.
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*/
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export function humanFileSize(bytes, si=false, dp=1) {
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const thresh = si ? 1000 : 1024;
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if (Math.abs(bytes) < thresh) {
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return bytes + ' B';
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}
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const units = si
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? ['kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']
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: ['KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'];
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let u = -1;
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const r = 10**dp;
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do {
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bytes /= thresh;
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++u;
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} while (Math.round(Math.abs(bytes) * r) / r >= thresh && u < units.length - 1);
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return bytes.toFixed(dp) + ' ' + units[u];
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} |