TypeError: Cannot mix BigInt and other types, use explicit conversions

Question

I am trying to generate a 20 digit random number:

let code = Math.floor(10000000000000000000n + Math.random() * 90000000000000000000n)

I have tried putting the numbers in BigInt() as well as adding a n after but still this error comes.

Uncaught TypeError: Cannot mix BigInt and other types, use explicit conversions

Does this answer your question? [Why BigInt demand explicit conversion from Number?](https://stackoverflow.com/questions/57996921/why-bigint-demand-explicit-conversion-from-number) — Peter O., Aug 26 '20 at 06:25
@LiuLei It throws an error saying `The number 0.9062354423176955 cannot be converted to a BigInt because it is not an integer` — Manan Sharma, Aug 26 '20 at 06:31
@LiuLei I tried Explicit Conversion to all 3 values, still getting the same error — Manan Sharma, Aug 26 '20 at 06:35

Liu Lei · Accepted Answer · 2020-08-26T06:51:51.493

10

// An operation with a fractional result will be truncated when used with a BigInt.

const rounded = 5n / 2n
// ↪ 2n, not 2.5n

// BigInt value can only operator with same type

// random BigInt
BigInt(Math.floor(Math.random() * 10))

// generate a 20 digit random number
BigInt(Math.floor(Math.random() * 100000000000000000000))

you can check this

edited Aug 26 '20 at 06:51

answered Aug 26 '20 at 06:38

Liu Lei

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Hey, but I do need that `Math.random()` function since I'm trying to return a random 20 digit value. The truncating is not a problem though. – Manan Sharma Aug 26 '20 at 06:43

TypeError: Cannot mix BigInt and other types, use explicit conversions

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