How I can turn a C# function into a node.js one

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I don't know C# very well and I get stuck. How this C# function would look in node/javascript?

C#

static byte[] HashToBytes(string hash, bool reversed = false)
        {
            byte[] ret = new byte[hash.Length / 3];
            for (int i = 0; i < ret.Length; i++)
            {
                ret[i] = byte.Parse(hash.Substring((reversed ? ret.Length - i - 1 : i) * 3, 3));
            }
            return ret;
        }

What I have tried:

I tried making it myself but if hash would be 155122110083109073090099, on javascript I get C0D12583FE7A009B instead of 635A496D536E7A9B, like how I get on C#

JavaScript

function HashToBytes(hash) {
    var byte = await Buffer.alloc(hash.length / 3)
    for(var i = 0; i < byte.length; i++) {
      byte[i] = await Buffer.from(hash.substring((byte.length - i - 1) * 3, 3))
    }
}

Posted 11-Aug-19 20:51pm

AlexT2

Updated 11-Aug-19 21:49pm

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Richard MacCutchan · Answer 1 · 2019-08-11T21:50:00

Your C# code:

C#

ret[i] = byte.Parse(hash.Substring((reversed ? ret.Length - i - 1 : i) * 3, 3));

Means if the reversed flag is false then use the next byte in sequence.

Your Javascript code:

JavaScript

byte[i] = await Buffer.from(hash.substring((byte.length - i - 1) * 3, 3))

Is selecting the source data bytes in reverse order. Just use the value of i as the offset, thus:

JavaScript

byte[i] = await Buffer.from(hash.substring((i) * 3, 3))