function encode(int,encoding=256,signed){ let size=2n**BigInt(encoding) let toReturn=null, filling="", sign="" if(typeof int!=="bigint"){int=BigInt(int)} //determining the binary string value if(int.toString()[0]==="-"){ signed?sign=1:null //change sign from empty string to 1(meaning negative) if a signed bit, else do nothing toReturn=(size-(int%size)).toString(2) } else{ signed?sign=0:null //change sign from empty string to 0(meaning positive) if a signed bit, else do nothing toReturn=(int%size).toString(2) } //to fill the spaces of empty bits let length=encoding-toReturn.length for(let i=0;i<length;i++){filling+=0} return sign+filling+toReturn //returns a String of 1s and 0s representing a binary encoded number } function decode(string,signed){ //returns a BigInt of the encoded string's value return signed? -1n*BigInt("0b"+string.substr(1)): //the signed translation BigInt("0b"+string) //the unsigned translation } console.log(encode(42)) //unsigned binary 256 bit of normal number console.log(encode(4213213283721893738293789312731893n)) //unsigned binary 256 bit of a BigInt console.log(encode("21157920892373161954235709850086879078532699846656405640394575840079131296399362")) //unsigned binary 256 bit of number larger than 2**256 console.log(encode("-21157920892373161954235709850086879078532699846656405640394575840079131296399362",128)) //unsigned binary 128 bit of number larger than 2**128 console.log(encode("-21157920892373161954235709850086879078532699846656405640394575840079131296399362",128,true)) //signed binary 128 bit of number larger than 2**128 console.log(decode( //unsigned encoded string DECODED encode(4213213283721893738293789312731893n) )) console.log(decode( //signed encoded string DECODED encode(-4213213283721893738293789312731893n),true ))