How to parse String to double with 18 decimal values in Dart/Flutter?

Question

I need to parse a String with 18 decimal values to double, but it seems double only support 14 decimal values.

For example: “15.123456789101112131”

Check out this arbitrary precision floating point impl: pub.dev/documentation/quantity/latest/number/Precise-class.html — Richard Heap
– Richard Heap, Commented Jan 31, 2022 at 13:25
The double type is a binary floating-point type, so storing a specific number of decimal digits is a bit nonsensical. If you want to store a specific number of decimal digits, use a type appropriate for that, such as the Precise class mentioned above or package:decimal. — jamesdlin
– jamesdlin, Commented Jan 31, 2022 at 19:40
Thank you, RichardHeap and jamesdlin, for replying to my question; your answer was helpful. — Adil Sakout
– Adil Sakout, Commented Feb 7, 2022 at 10:52

KAnggara75 · Accepted Answer · 2022-01-31 14:08:30Z

1

Precise(
       String value,
       {int sigDigits = 50}
)

Constructs an arbitrary precision number from a string.

The precision can be limited by providing the maximum number of significant digits (default is 50).

Examples: Precise('12') Precise('0.1234') Precise('15.123456789101112131') Precise('1.23456789e-6', sigDigits: 4)

answered Jan 31, 2022 at 14:08

KAnggara75

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