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While declaring a Function member in a class we can do both;
Function first;
Function() second;
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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 .
Dart function is a set of codes that together perform a specific task. It is used to break the large code into smaller modules and reuse it when needed. Functions make the program more readable and easy to debug. It improves the modular approach and enhances the code reusability.
A function (also might be referenced to as method in the context of an object) is a subset of an algorithm that is logically separated and reusable. It can return nothing (void) or return either a built-in data type or a custom data type. It can also have no parameters or any number of parameters.
Dart classes are the blueprint of the object, or it can be called object constructors. A class can contain fields, functions, constructors, etc. It is a wrapper that binds/encapsulates the data and functions together; that can be accessed by creating an object.
Function represents any function:void function() {}
int anotherFunction(int positional, {String named}) {}
Function example = function; // works
example = anotherFunction; // works too
Function() represents a function with no parameter:void function() {}
int anotherFunction(int positional, {String named}) {}
Function() example = function; // works
example = anotherFunction; // doesn't compile. anotherFunction has parameters
A variant of Function() could be:
void Function() example;
Similarly, we can specify parameters for our function:
void function() {}
int anotherFunction(int positional, {String named}) {}
int Function(int, {String named}) example;
example = function; // Doesn't work, function doesn't match the type defined
example = anotherFunction; // works
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