javascript - Base 36 to BigInt?

Question

Suppose I want to convert a base-36 encoded string to a BigInt, I can do this:

BigInt(parseInt(x,36))

But what if my string exceeds what can safely fit in a Number? e.g.

parseInt('zzzzzzzzzzzzz',36)

Then I start losing precision.

Are there any methods for parsing directly into a BigInt?

Answer 1

You could convert the number to a bigint type.

function convert(value, radix) {
    return [...value.toString()]
        .reduce((r, v) => r * BigInt(radix) + BigInt(parseInt(v, radix)), 0n);
}

console.log(convert('zzzzzzzzzzzzz', 36).toString());