Base62

About Base62

Base62 consist of 0-9A-Za-z and use to compress big Base10 into sort number. That may considered one kind of Encryption like Base64.

Why Base62

Base10 number quite difficult to memorized where Base62 compress/represent by sort length String.

Base62 Encode

/**
 * =============================================================================
 * Number.prototype.toBase62() developed aim to reduce(compress) the length of
 * big sized Integer Number. We developed it like regular base62 convention to
 * support popular most web browser in prior to the Sencha Ext JS MVVM
 * =============================================================================
 * @author    Chorke Inc<[email protected]>
 * @version   1.0.00.GA
 * @since     1.0.00.GA
 * =============================================================================
 * @method    Number.prototype.toBase62()
 * @package   Number.prototype
 * @class     Number
 * @public
 * =============================================================================
 */
CKi.proto(Number, 'toBase62', function(){
    var base10  = parseInt(this),
        modulus, base62;
    
    //for((confirm base10 integer);(prevents base10 negative integer);(bitwise hack to fail big integer))
    for ((base10 = base10 !== +base10 || base10 % 1 ? -1 : base10, base62 = ''); (base10 >= 0); (base10 = Math.floor(base10 / 62) || -1)){
        // base10 % 62 ->  0 - 61
        // 0 - 9 | 36-61 | 10- 35
        // 48-57 | 65-90 | 97-121
        // 0 - 9 | A - Z | a -  z
        base62 = String.fromCharCode(((modulus = base10 % 62) > 9 ? modulus > 35 ? 29 : 87 : 48) + modulus) + base62;
    }
    return base62;
});

Base62 Dencode

/**
 * =============================================================================
 * String.prototype.toBase10() developed aim to expand(decompress) the length
 * of big sized Integer Number. We developed it like regular base62 convention
 * to support popular most web browser in prior to the Sencha Ext JS MVVM
 * =============================================================================
 * @author    Chorke Inc<[email protected]>
 * @version   1.0.00.GA
 * @since     1.0.00.GA
 * =============================================================================
 * @method    String.prototype.toBase10()
 * @package   String.prototype
 * @class     String
 * @public
 * =============================================================================
 */
CKi.proto(String, 'toBase10', function(){
    var base62  = String(this),
        iterator, ascii, base10;
    
    //for((confirm base10 string);(if 'iterator' equals '-1', 'ascii' is 'NaN' cases break the loop);)
    for ((base10 = iterator = (base62 === (/\W|_|^$/.test(base62 += '') || base62) ) - 1);(ascii = base62.charCodeAt(iterator++));){
        base10 = base10 * 62 + ascii - [, 48, 29, 87][ascii >> 5];
    }
    return base10;
});