Dart Functions

A function in Dart or in any programming language has a specific name and has a set of programming statements. The function can be called at any location of the program to run the statements it has and returns a result, or performs some operations. This process saves time and effort in writing all the function statements one time, then at a certain location of the code call this function by its name to perform a specific procedure or return a value. Also, functions help in organising the program to structured parts which help in program maintenance and any future modifications.

Each function has a unique name which is used to call it inside the Dart program several times without the need to duplicate statements in multiple source code files.Most programming languages come with a prewritten set of functions that are kept in a library.

Uses of Functions

The few benefits of the Dart function are given below.

Optimises the code.
It makes debugging easier.
It makes development easy and creates less complexity.
It increases the module approach to solve the problems.
It enhances the re-usability of the program.
We can do the coupling of the programs.

Creating a Function

If you have a number of code statements that need to be used more than once within your program, you can gather them inside a function which has a specific name and then call this function within the program as many times as needed.

Example: In the following example, if you run the following code, the compiler will run the code which is in the main function only.

main() {

}

PrintSomething(){

print("Hello World!!");

print("Welcome to i=India");

}

Let's understand the general syntax of the defining function.

parameter_list - It denotes the list of the parameters, which is necessary when we call a function.
return value - A function returns a value after completing its execution.
return_type - It can be any data type such as void, integer, float, etc. The return type must be matched with the returned value of the function.
func_name - It should be an appropriate and valid identifier.

Example - 1

void main() {

print("Example of multiply two number using the function");

// Creating a Function

int sum(int a, int b){

// function Body

int result;

result = a*b;

return result;

}

// We are calling a function and storing a result in variable c

var c = multiply(5,6);

print("The sum of two numbers is: ${c}");

}

Output

Example of add two number using the function

The sum of two numbers is: 30