In Dart, a method or function can be declared using the function keyword followed by the function name. Here are a few examples:
// Function with no parameters and no return type
void greet() {
print("Hello, world!");
}
// Function with parameters and return type
int add(int a, int b) {
return a + b;
}
// Optional parameters
void optionalParameter(String name, [int age]) {
age ??= 18; // Default value if age is not provided
print("Name: $name, Age: $age");
}
// Named parameters
void namedParameter({String name, int age}) {
age ??= 18; // Default value if age is not provided
print("Name: $name, Age: $age");
}
The void keyword is used when a function doesn't return any value. The return statement is used to return a value from a function of a specific type.
The optionalParameter function accepts one required parameter name and an optional parameter age. If age is not provided, it is assigned the default value of 18.
The namedParameter function accepts two named parameters name and age. These parameters can be called in any order while invoking the function. If age is not provided, it is assigned the default value of 18.