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What does external mean in Dart? For example: external DateTime._now();
I'm new to Dart, I can't find documentation for external, so can you give an example to help explain？
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Unless the method is declared as static it is classified as an instance method in a class. They are allowed to access instance variables. To call the method of this class you have to first create an object.
Functions are the building blocks of readable, maintainable, and reusable code. A function is a set of statements to perform a specific task. Functions organize the program into logical blocks of code. Once defined, functions may be called to access code.
A function is a top-level function which is declared outside of a class or an inline function that is created inside another function or inside method. A method is tied to an instance of a class and has an implicit reference to this .
In Dart, we use the late keyword to declare variables that will be initialized later. These are called non-nullable variables as they are initialized after the declaration. Hence, we use the late keyword. Note: Once we declare a non-nullable late variable, the variable can't be null at runtime.
9.4 External Functions
An external function is a function whose body is provided separately from its
declaration. An external function may be a top-level function (17), a method
The body of the function is defined somewhere else.
As far as I know this is used to fix different implementations for Dart VM in the browser and Dart VM on the Server.
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