Type Inference - Dart Programming

var lets the compiler pick the type from the initializer. Each binding still has a fixed static type, so int mixed with double widens the result to double while a quoted literal stays a String.

Program

Play the program to watch Dart infer int, double, String, and a widened total.

types_inference.dart

void main() {
  var count = 3;
  var price = 2.5;
  var label = 'items';
  var total = count * price;
  print('$count $label cost $total');
}

var `var` lets the compiler infer the type from the initializer; the binding still has a fixed static type.

inferred numeric `3` infers `int`, `2.5` infers `double`; mixing them widens the result to `double`.

string inference A quoted literal like `'items'` infers `String`; `var` does not mean `dynamic`.