Is it possible to base 36 encode with JavaScript / jQuery?

Question

I\'m thinking about using the encode/decode technique here (Encoding to base 36/decoding from base 36 is simple in Ruby)

how to implement a short url like urls in twitte

Answer 1

For anyone looking for how to encode a string in base36 (since this question, How do i convert string to base36 in javascript , is redirected here) -

Here's what I came up with.

/* encode / decode strings to / from base36 

   based on: http://snipplr.com/view/12653/
*/

var base36 = {
    encode: function (str) {
        return Array.prototype.map.call(str, function (c) {
            return c.charCodeAt(0).toString(36);
        }).join("");
    },
    decode: function (str) {
        //assumes one character base36 strings have been zero padded by encodeAscii
        var chunked = [];
        for (var i = 0; i < str.length; i = i + 2) {
            chunked[i] = String.fromCharCode(parseInt(str[i] + str[i + 1], 36));
        }
        return chunked.join("");
    },
    encodeAscii: function (str) {
        return Array.prototype.map.call(str, function (c) {
            var b36 = base36.encode(c, "");
            if (b36.length === 1) {
                b36 = "0" + b36;
            }
            return b36;
        }).join("")
    },
    decodeAscii: function (str) {
        //ignores special characters/seperators if they're included
        return str.replace(/[a-z0-9]{2}/gi, function (s) {
            return base36.decode(s);
        })
    }
};

var foo = "a-Az-Z 0-9 !@#$%^&*()-_=+[{]};:',<.>/?`~";
var bar = base36.encodeAscii(foo);

console.log(foo);
console.log(base36.decode(bar));

console.log('');

var bar = "==/" + bar + "\\==";
console.log(bar)
console.log(base36.decodeAscii(bar));


//doesn't work
console.log('');
var myString = "some string";
var myNum = parseInt(myString, 36);
console.log(myNum.toString(36))

myString = "FooBarW000t";
myNum = parseInt(myString, 36);
console.log(myNum.toString(36))

myString = "aAzZ09!@#$%^&*()-_=+[{]};:',<.>/?`~";
myNum = parseInt(myString, 36);
console.log(myNum.toString(36))

/* 
Outputs:

a-Az-Z 0-9 !@#$%^&*()-_=+[{]};:',<.>/?`~
a-Az-Z 0-9 !@#$%^&*()-_=+[{]};:',<.>/?`~

==/2p191t3e192i0w1c191l0w0x1s0z10112m12161415192n1p172j3f2l3h1n1m13181o1a1q1b1r2o3i\==
==/a-Az-Z 0-9 !@#$%^&*()-_=+[{]};:',<.>/?`~\==

some
foobarw000w
aazz09
*/