Convert Base 10 to Base 64 and vise versa using JavaScript

Convert Base 10 to Base 64 and vise versa using JavaScript

This is the way to convert base 10 (a decimal number) into a base 64 string and base 64 into a base 10, while the order of that base is as following:

0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-

Base 10 to Base 64

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function base10_to_base64(num) {
    var order = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-";
    var base = order.length;
    var str = "", r;
    while (num) {
        r = num % base
        num -= r;
        num /= base;
        str = order.charAt(r) + str;
    }
    return str;
}

Base 64 to Base 10

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function base64_to_base10(str) {
    var order = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-";
    var base = order.length;
    var num = 0, r;
    while (str.length) {
        r = order.indexOf(str.charAt(0));
        str = str.substr(1);
        num *= base;
        num += r;
    }
    return num;
}

Live Test

Base 10:
Base 64:

Good luck!

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