Convert From/To Binary/Decimal/Hexadecimal in JavaScript

baseConverter.js

/**
* Convert From/To Binary/Decimal/Hexadecimal in JavaScript
* https://gist.github.com/faisalman
* https://gist.github.com/AndreasHeiberg
*
* Copyright 2012-2015, Faisalman <[email protected]>
* Licensed under The MIT License
* http://www.opensource.org/licenses/mit-license
*/

(function(){

    var ConvertBase = {
        data: {},

        subject: function(subject) {
            this.data.subject = subject;
            return this;
        },

        from: function (baseFrom) {
            this.data.baseFrom = baseFrom;
            return this;
        },

        to: function(baseTo) {
            this.data.baseTo = baseTo;
            this.data.result = parseInt(this.data.subject, this.data.baseFrom).toString(this.data.baseTo);

            return this;
        },

        result: function() {
            return this.data.result;
        },

        // Could create function using bitwise operators, but life is too short :D
        // I would much prefer working with more understandable datastructures and operators.

        pad: function (bits) {
            if (bits) {
                var binPadded = "00000000000000000000000000000000" + this.data.result;

                this.data.result = binPadded.substr(binPadded.length - bits);
            }

            return this;
        },

        // binary to decimal
        bin2dec: function (num) {
            return this.subject(num).from(2).to(10).result();
        },
        
        // binary to hexadecimal
        bin2hex: function (num) {
            return this.subject(num).from(2).to(16).result();
        },
        
        // decimal to binary
        dec2bin: function (num, bits) {
            return this.subject(num).from(10).to(2).pad(bits).result();
        },
        
        // decimal to hexadecimal
        dec2hex: function (num) {
            return this.subject(num).from(10).to(16).result();
        },
        
        // hexadecimal to binary
        hex2bin: function (num, bits) {
            return this.subject(num).from(16).to(2).pad(bits).result();
        },
        
        // hexadecimal to decimal
        hex2dec: function (num) {
            return this.subject(num).from(16).to(10).result();
        },

        upperAndLowerBit2dec: function (bits) {
            // we get 2 bytes in an array
            // convert the 2 bytes to hex bytes
            hexUpper = this.dec2hex(bits[0]);
            hexLower = this.dec2hex(bits[1]);
      
            // now concatinate the two hex bytes fb + 74 = 0xfb74
            // and convert that hexadecimal into a decimal
            return this.hex2dec(hexUpper + hexLower);
        },

        upperAndLowerBit2float: function (bits, fraction) {
            var number = this.upperAndLowerBit2dec(bits);

            return this.unsignedIntToFloat(number, fraction);
        },

        unsignedIntToFloat: function (number, fraction) {
            var signedNumber = this.unsignedToSignedInt(number);

            return this.signedIntToFloat(signedNumber, fraction);
        },

        // Convert signed int to float using bit shifting of {fraction} 
        signedIntToFloat: function (number, fraction) {
            return signedNumber / (1 << fraction);
        },

        unsignedToSignedInt: function(number) {
            // if the number is desired as a float from an int with a binary point
            // convert the unsigned int to a float with the binary point at the {fraction} bit

            // convert from unsigned int to signed
            var b = new ArrayBuffer(2);
            var u = new Uint16Array(b);
            var i = new Int16Array(b);

            u[0] = number;
            var signedNumber = i[0];

            return signedNumber;
        }
    }
    
    this.ConvertBase = ConvertBase;
    
})(this);

/*
* Usage example:
* ConvertBase.bin2dec('111'); // '7'
* ConvertBase.dec2hex('42'); // '2a'
* ConvertBase.hex2bin('f8'); // '11111000'
* ConvertBase.dec2bin('22'); // '10110'
*/