dart.md

Dart online compiler

Write, Run & Share Dart code online using OneCompiler's Dart online compiler for free. It's one of the robust, feature-rich online compilers for the Dart language, running the latest Dart version 3.6.1. Getting started with OneCompiler's Dart editor is easy and fast. The editor shows sample boilerplate code when you choose Dart as the language and start coding.

Taking inputs (stdin)

OneCompiler's Dart online editor supports stdin, and users can provide inputs to programs using the STDIN textbox under the I/O tab. The following is a sample Dart program that takes a name as input and prints a greeting message.

import 'dart:io';

void main() {
  String? name = stdin.readLineSync();
  print("Hello $name");
}

About Dart

Dart is an open-source, general-purpose programming language developed by Google. It is optimized for building mobile, desktop, server, and web applications. Dart is known for its simplicity, fast execution, and easy-to-learn syntax. It is the primary language used in Flutter for building cross-platform mobile apps.

Syntax help

Variables

• Dart is a statically typed language but also supports dynamic typing.
• Variables can be explicitly typed or inferred using var.
• The final and const keywords define immutable variables.

Examples

// Explicitly typed variables
int a = 10;
String name = "OneCompiler";

// Type inference using var
var x = 30;

// Final and Const
final String appName = "OneCompiler";
const double pi = 3.14;

Value Type	Description
int	Represents integer numbers
double	Represents floating-point numbers
String	Represents text
bool	Value can be either true or false
List	Represents an ordered collection of elements
Map	Represents key-value pairs
Set	Represents an unordered collection of unique elements
Runes	Represents Unicode characters
Null	Represents the absence of a value
dynamic	Can hold any type of value

Loops

1. While:

The while loop is used to execute a set of statements while a condition holds true.

while (condition) {
  // code
}

2. Do-While:

The do-while loop executes the code at least once before checking the condition.

do {
  // code
} while (condition);

3. For:

The for loop is used when the number of iterations is known in advance.

for (int i = 0; i < 5; i++) {
  // code
}

4. For-in:

Used for iterating over collections like lists or sets.

List<String> names = ['Alice', 'Bob', 'Charlie'];
for (String name in names) {
  print(name);
}

5. ForEach:

An alternative way to iterate over collections.

names.forEach((name) {
  print(name);
});

Functions

A function is a reusable block of code that performs a specific task.

// Function with return type
int add(int a, int b) {
  return a + b;
}

// Function without return type
void greet(String name) {
  print("Hello, $name");
}

// Arrow function (short-hand syntax)
int multiply(int a, int b) => a * b;

---

This guide provides a quick reference to Dart programming syntax and features. Start coding in Dart using OneCompiler's Dart online compiler today!