verhoeff.js

String.prototype.verhoeffCheck = (function()
    {
    var d = [[0,1,2,3,4,5,6,7,8,9],
            [1,2,3,4,0,6,7,8,9,5],
            [2,3,4,0,1,7,8,9,5,6],
            [3,4,0,1,2,8,9,5,6,7],
            [4,0,1,2,3,9,5,6,7,8],
            [5,9,8,7,6,0,4,3,2,1],
            [6,5,9,8,7,1,0,4,3,2],
            [7,6,5,9,8,2,1,0,4,3],
            [8,7,6,5,9,3,2,1,0,4],
            [9,8,7,6,5,4,3,2,1,0]];
    var p = [[0,1,2,3,4,5,6,7,8,9],
            [1,5,7,6,2,8,3,0,9,4],
            [5,8,0,3,7,9,6,1,4,2],
            [8,9,1,6,0,4,3,5,2,7],
            [9,4,5,3,1,2,6,8,7,0],
            [4,2,8,6,5,7,3,9,0,1],
            [2,7,9,3,8,0,6,4,1,5],
            [7,0,4,6,9,1,3,2,5,8]];
    var j = [0,4,3,2,1,5,6,7,8,9];

    return function()
    {
        var c = 0;
        this.replace(/\D+/g,"").split("").reverse().join("").replace(/[\d]/g, function(u, i, o){
            c = d[c][p[i&7][parseInt(u)]];
        });
        return (c === 0);
    };
})();

String.prototype.verhoeffGen = (function()
    {
    var d = [[0,1,2,3,4,5,6,7,8,9],
            [1,2,3,4,0,6,7,8,9,5],
            [2,3,4,0,1,7,8,9,5,6],
            [3,4,0,1,2,8,9,5,6,7],
            [4,0,1,2,3,9,5,6,7,8],
            [5,9,8,7,6,0,4,3,2,1],
            [6,5,9,8,7,1,0,4,3,2],
            [7,6,5,9,8,2,1,0,4,3],
            [8,7,6,5,9,3,2,1,0,4],
            [9,8,7,6,5,4,3,2,1,0]];
    var p = [[0,1,2,3,4,5,6,7,8,9],
            [1,5,7,6,2,8,3,0,9,4],
            [5,8,0,3,7,9,6,1,4,2],
            [8,9,1,6,0,4,3,5,2,7],
            [9,4,5,3,1,2,6,8,7,0],
            [4,2,8,6,5,7,3,9,0,1],
            [2,7,9,3,8,0,6,4,1,5],
            [7,0,4,6,9,1,3,2,5,8]];
    var j = [0,4,3,2,1,5,6,7,8,9];

    return function()
    {
        var c = 0;
        num = this + '0';
        num.replace(/\D+/g,"")
        	.split("")
        	.reverse()
        	.map(function(u, i){
            		c = d[c][p[i&7][parseInt(u)]];
        		})
        	.join("")
        return num.slice(0,num.length-1) + j[c];
    };
})();