Dart (programming language): Difference between revisions

Revision as of 18:35, 23 August 2025

Revision as of 14:55, 28 August 2025

Line 225:

<syntaxhighlight lang="dart">

void main() {

print('Hello, World!');

}

</syntaxhighlight>

Line 233:

<syntaxhighlight lang="dart">

void main() {

for (varint i = 1; i <= 10; i++) {

print(i);

}

}

</syntaxhighlight>

Line 243:

<syntaxhighlight lang="dart">

void main() {

var int i = 20;

print('fibonacci($i) = ${fibonacci(i)}');

}

Line 264:

class Point {

// Final variables cannot be changed once they are assigned.

// Declare two instance variables.

final num x, y;

// A constructor, with syntactic sugar for setting instance variables.

// The constructor has two mandatory parameters.

Point(this.x, this.y);

// A named constructor with an initializer list.

Point.origin():

: x = 0, y = 0;

y = 0;

// A method.

num distanceTo(Point other) {

var num dx = x - other.x;

var num dy = y - other.y;

return math.sqrt(dx * dx + dy * dy);

}

// Example of a "getter".

// Acts the same as a final variable, but is computed on each access.

num get magnitude => math.sqrt(x * x + y * y);

// Example of operator overloading

Point operator +(Point other) => Point(x + other.x, y + other.y);

// When instantiating a class such as Point in Dart 2+, new is

// an optional word

}

// All Dart programs start with main().

void main() {

// Instantiate point objects.

var Point p1 = Point(10, 10);

print(p1.magnitude);

var Point p2 = Point.origin();

var num distance = p1.distanceTo(p2);

print(distance);

}

</syntaxhighlight>