number-radix-64

let number prototype toString support radix 64

``
var SYMBOL, SYMBOL_LEN, toString;

SYMBOL = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_".split("");

SYMBOL_LEN = SYMBOL.length;

toString = Number.prototype.toString;

Number.prototype.toString = function(radix) {
var conversion, decimal;
if (radix && radix > 36 && radix <= SYMBOL_LEN) {
decimal = this;
conversion = "";
while (decimal >= 1) {
conversion = SYMBOL[decimal - (radix * Math.floor(decimal / radix))] + conversion;
decimal = Math.floor(decimal / radix);
}
return conversion;
} else {
return toString.call(this, radix);
}
};
``