Trying to convert users message into hex from decimal using Discord bot

Question

Ok so I have this

Commands.hex = {
  name: 'hex',
  help: "I'll convert your steamid for you",
  timeout: 10,
  level: 0,
  fn: function (msg, suffix) {
    msg.reply('Steam64').then((m) => {
      m.edit('<@' + msg.author.id + '>, Steam ID Converted: ' + suffix.toString(16)).slice(-2).toUpperCase()
    })
  }
}

i'm trying to get it to do what this website does http://www.binaryhexconverter.com/decimal-to-hex-converter

I'm just trying to get it to convert for my discord bot, thank you!

What type does 'suffix' come to you as? If it's a string then I imagine you have to call `parseInt` on it first since `toString(16)` will only work correctly if suffix is already an integer. — Khauri, Nov 06 '17 at 19:56
suffix is the users message I believe. as you see it says !!hex 76561198205234861 @KhauriMcClain — Jake Pavek, Nov 06 '17 at 19:59
Yes I understand. But most likely the user's message will be passed a string rather than an integer, and thus calling `toString(16)` on a string will not work. `(10).toString(16)` will return "a", but `("10").toString(16)` will return "10" — Khauri, Nov 06 '17 at 20:03
Sorry I am learning tried this `m.edit('<@' + msg.author.id + '>, Steam ID Converted: ' + parseInt(suffix).toString(16))` @KhauriMcClain — Jake Pavek, Nov 06 '17 at 20:17
actually this is weird http://prntscr.com/h71s23 I get that on the website but on discord I get this http://prntscr.com/h71sgf — Jake Pavek, Nov 06 '17 at 20:32

score 1 · Accepted Answer · answered Nov 07 '17 at 14:53

As it turns out your value: 76561198262006743 is much greater than Number.MAX_SAFE_VALUE, which is (2^53 -1). This will lead to undefined behavior when trying to do arithmetic.

For example, on Google Chrome when typing just the number into the console and pressing enter, that value became 76561198262006740 (note the 3 at the end became a 0), which meant the hex conversion was incorrect as well.

An easy solution is, since you already have the value as a string, would be to perform your own decimal->hex conversion.

One such algorithm can he found here: https://stackoverflow.com/a/21668344/8237835

A small comparison of the results of Number#toString(16) and dec2hex(String):

function dec2hex(str){ // .toString(16) only works up to 2^53
    var dec = str.toString().split(''), sum = [], hex = [], i, s
    while(dec.length){
        s = 1 * dec.shift()
        for(i = 0; s || i < sum.length; i++){
            s += (sum[i] || 0) * 10
            sum[i] = s % 16
            s = (s - sum[i]) / 16
        }
    }
    while(sum.length){
        hex.push(sum.pop().toString(16))
    }
    return hex.join('')
}

num = "76561198262006743"

console.log("dec2Hex: " + dec2hex(num))

console.log("toString: " + parseInt(num).toString(16))

Trying to convert users message into hex from decimal using Discord bot

1 Answers1