String prototype that converts the given message to a binary String.

toBinary.coffee

//coffescript version

String::toBinary = ->
  @split("").reduce (result, char) ->
    bin = char.charCodeAt(0).toString(2)
    result += "00000000".slice(0, 8 - bin.length) + bin
  , ""

toBinary.js

// IE8 compatible version

String.prototype.toBinary = function(){
    var result;    
    for(var i = 0, l = this.length; i<l; i++){
        var bin = this.charCodeAt(i).toString(2);
        result += '00000000'.slice(0,8-bin.length)+bin;
    }
    return result;
};

toBinary2.js

// ie9 and higher version

String.prototype.toBinary = function() {
    return this.split('').reduce(function(result,char){
        var bin = char.charCodeAt(0).toString(2);
        return (result += '00000000'.slice(0,8-bin.length)+bin);
    },'');
};