Imagine you have a large codebase with a lot of people working on it. You introduce a new parameter to a commonly used function or object. However, you don't want to make the parameter mandatory because there m
The core problem is that Dart makes a semantic distinction between "passednull" and "did not pass a value", but the latter has no first-class representation in the language. Where JS hasundefined, we have nothing. Getting rid ofundefinedis great, but our optional parameter semantics still ha...
function (parameter_1, parameter_2=default_value, parameter_3=default_value ){ // parameter_2, and parameter_3 are optional parameters } Parameters default_value − It can be any value of the string, number, or other data types. Example 1 In the below example, users can learn how we...
To define optional parameters in TypeScript functions, you can use the question mark (?) symbol after the parameter name in the function declaration. This indicates that the parameter is optional and can be omitted when calling the function. The general syntax for a function with optional paramet...
i have errors in Ln12 import 'package:flutter/material.dart'; import 'package:google_maps_flutter/google_maps_flutter.dart'; import '../models/place.dart'; class MapScreen extends StatefulWidget { final PlaceLocation initialLocation; fin...