Gigantic Numbers

The BigInt type was added to JS to work with integers of arbitrary length. The regular Number type is limited to a safe range of ±(2^53 - 1). Anything larger turns into mush.

1. Creation

const huge = 12345678901234567890n; // 'n' at the end means BigInt
const alsoHuge = BigInt("12345678901234567890");

2. Survival Rules

1. Don't mix: you cannot add 10n + 5. You will get an error. Convert everything to one type first: 10n + BigInt(5).
2. Integers only: 5n / 2n results in 2n. The fractional part is simply dropped.
3. Comparison: 5n == 5 yields true, but 5n === 5 yields false (they are different types!).