How to print human readable byte counts

I came across https://programming.guide/java/formatting-byte-size-to-human-readable-format.html this morning, and having a few minutes, adapted the Java code to Julia:

https://www.cs.nmsu.edu/~mleisher/julia/hrbc.jl

Being relatively new to Julia, this code is a little clumsy, but I’m sure someone can improve it. If anyone wants to adapt it to support Zetta and Yotta byte values, please do.

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Here is a shorter version that is converted from a javascript stackoverflow answer

function format_bytes(bytes, decimals = 2)
    bytes == 0 && return "0 Bytes"
    k = 1024
    dm = decimals < 0 ? 0 : decimals
    sizes = ["Bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"]
    i = convert(Int, floor(log(bytes) / log(k)))
    return string(round((bytes / ^(k, i)), digits=dm)) * " " * sizes[i+1];
end

Tested on Julia 1.3.1.

There is also this (used by @time etc, not exported):

julia> Base.format_bytes(13422449238)
"12.501 GiB"
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