type 'int' is not a subtype of type 'double?'

[dhilshana]

This usually happens when an API response or data processing step returns an int value, but my model or function is expecting a double?.

When a double variable is assigned an int value, implicit conversion from int to double is possible. However, the mentioned error occurs in this case.

[dart-github-bot]

Summary: The issue arises when an API response or data processing step returns an integer value, but the code expects a nullable double. While implicit conversion from int to double is possible, the code throws an error in this scenario.

[jasimrazi]

I'm experiencing the same problem. Can you suggest a solution?

[mraleph]

Dart¹ does not implicitly coerce int to double (or vice versa), because (among other reasons) such conversions are not loss-less. You have to explicitly convert using num.toDouble() or num.toInt().

Footnotes

1. With the exception of JavaScript backend (dart2js) which uses JavaScript numbers to represent both int and double. ↩