Declare A Function With Single Parameter In Dart

Dart, a general-purpose programming language, offers high-end scalability and can be used to define functions that have a single parameter. This article presents a simple guide to declaring a function with a single parameter in Dart.

Code snippet: Declaring a Single Parameter Function in Dart

void main() {
  displayMessage('Hello Dart!');
}

void displayMessage(String message) {
  print(message);
}

Code Explanation for Declaring a Single Parameter Function in Dart

In the provided code snippet, we have written a simple Dart program that declares a function with a single parameter. Let’s walk through it step by step:

1. First, we define the main() function which is the entry point of every Dart application.

void main() {
  displayMessage('Hello Dart!');
}

In this main() function, we call another function displayMessage() with the string parameter 'Hello Dart!'.

2. Next, we declare the displayMessage() function that has a single string parameter message.

void displayMessage(String message) {
  print(message);
}

As we can see, displayMessage() function is declared with void as its return type indicating it doesn’t return a value. It accepts a single argument message of type String. The function prints whatever message it receives as an argument.

3. When this program is executed, the displayMessage() function is called from the main function with the string ‘Hello Dart!‘. The displayMessage() function receives this string and prints it.

This is a basic example on how to declare a function with a single parameter in Dart. This can be expanded with more complex logic inside the function to use the parameter effectively.