JavaScript - convert size in bytes to KB, MB, GB, TB, PB

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const SHORT_UNITS = ['B', 'KB', 'MB', 'GB', 'TB', 'PB'];
const FULL_UNITS = ['bytes', 'kilobytes', 'megabytes', 'gigabytes', 'terabytes', 'petabytes'];

const calculateParts = (size, units = SHORT_UNITS) => {
    const result = {};
    for (const unit of units) {
        const total = Math.floor(size / 1024);
        const rest = size - 1024 * total;
        if (rest) {
            result[unit] = rest;
        }
        size = total;
    }
    return result;
};



// ---------------------------------------------------
// Practical example 1:
// ---------------------------------------------------

{
    const parts = calculateParts(31108834345654325);

    console.log(
        parts.PB + 'PB ' +
        parts.TB + 'TB ' +
        parts.GB + 'GB ' +
        parts.MB + 'MB ' +
        parts.KB + 'KB ' +
        parts.B  + 'B'
    );
}


// Output:
//
//     27PB 645TB 327GB 712MB 806KB 52B



// ---------------------------------------------------
// Practical example 2:
// ---------------------------------------------------

{
    const parts = calculateParts(31108834345654325, FULL_UNITS);

    console.log(
        parts.petabytes + ' petabytes, ' +
        parts.terabytes + ' terabytes, ' +
        parts.gigabytes + ' gigabytes, ' +
        parts.megabytes + ' megabytes, ' +
        parts.kilobytes + ' kilobytes, ' +
        parts.bytes     + ' bytes'
    );
}


// Output:
//
//     27 petabytes, 645 terabytes, 327 gigabytes, 712 megabytes, 806 kilobytes, 52 bytes



// ---------------------------------------------------
// See also:
// ---------------------------------------------------
//
//     1. https://dirask.com/snippets/JavaScript-convert-size-in-bytes-to-KB-MB-GB-TB-PB-1XBMVp