Has the Dart lambda syntax for method an effect at runtime?

Question

In JavaScript there is a difference between m1 and m2:

class A { m1() { return 123; } m2 = () => 123; }

Here, m1 is stored in the prototype (it exists in the object that represents the class) while a copy of m2 is stored in each instance as a property. So the first syntax is better where it is adapted.

I would like to know if there is a similar difference in Dart for this kind of code:

class A { int m1() { return 123; } int m2() => 123; }

At runtime, are m1 and m2 completely equivalent?

Renato · Accepted Answer · 2021-11-05 09:53:11Z

In Dart, there's no difference.

The docs explain it:

The => expr syntax is a shorthand for { return expr; }. The => notation is sometimes referred to as arrow syntax.

The JavaScript difference is due to historical reasons and no sane language would have the same distinction between the two notations.

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