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How to check Type of a Variable in Flutter - Kindacode
Dart type you have NEVER used. Dart type system goes: never say never… | by Mangirdas Kazlauskas | Flutter Community | Medium
Run log: `Null check operator used on a null value`; Dart analysis: `The argument type 'double?' can't be assigned to the parameter type 'num'.` · Issue #613 · flutter/gallery · GitHub