Created
November 4, 2020 13:57
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typescript: get file size with unit of [Byte ~ GB]
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const units = ["Byte", "KB", "MB", "GB"]; | |
/** | |
* ファイルサイズに応じて、ファイル容量の数値と単位を取得 | |
* 多めに表示するためにceilしている | |
* | |
* @export | |
* @param {number} size | |
* @param {number} [floating=1] | |
* @returns | |
* @returns {([number, string] | [])} | |
*/ | |
export default function getFileSizeWithUnit( | |
size: number, | |
floating: number = 1 | |
): [number, string] | [] { | |
for (let i = 0; i < units.length; i += 1) { | |
if (size < 1024 ** (i + 1)) { | |
const floatingBase = 10 ** floating; | |
const num = | |
Math.ceil((size * floatingBase) / Math.max(1, 1024 ** i)) / | |
floatingBase; | |
return [num, units[i]]; | |
} | |
} | |
console.error("[getFileSizeWithUnit]: too large file size"); | |
return []; | |
} |
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