Why does 0.1 and 0.2 = 0.30000000000000004?

Re:Why does 0.1 and 0.2 = 0.30000000000000004? by altruios on Wednesday February 08, 2023 @04:47PM (#34715755)

besides bigInt...

What numbers in javascript are not actually doubles (what js uses under the hood for every number)?

You can convert them from doubles to 32-ints apparently by some bitwise hacks like (I'm pretty sure they still are 'doubles' though - and it just does some rounding tricks)

``` |0 //signed >>>0 //unsigned ```

So any webapp (google sheets) will likely have problems related to floating point math.

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Re:Why does 0.1 and 0.2 = 0.30000000000000004? by ElectricalUnion on Wednesday February 08, 2023 @05:56PM (#34716793)

> You can convert them from doubles to 32-ints

You can use the native BigInt arbitrary-precision integers and ignore all "fits under this arbitrary limited bit slice" problems.

You can use doubles as a integer directly, in a safe way, until you touch the 53 bits barrier (Number.MIN_SAFE_INTEGER === -9007199254740991 or Number.MAX_SAFE_INTEGER === 9007199254740991).

None of those really are (modern) webapp issues.

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