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dart const constructor

By VasteMondeVasteMonde on May 24, 2021
// If your class produces objects that never change
class ImmutablePoint {
  const ImmutablePoint(this.x, this.y);

  final int x;
  final int y;

  static const ImmutablePoint origin = ImmutablePoint(0, 0);

Source: dart.dev

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dart call constructor in constructor

By Happy HamerkopHappy Hamerkop on Oct 15, 2020
class Chipmunk {
  String name;
  int fame;

  Chipmunk.named(this.name, [this.fame]);

  Chipmunk.famous1() : this.named('Chip', 1000);
  factory Chipmunk.famous2() {
    var result = new Chipmunk.named('Chip');
    result.fame = 1000;
    return result;

Source: stackoverflow.com

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const constructor dart

By SantinoSantino on Mar 23, 2021
Const constructor creates a "canonicalized" instance.

That is, all constant expressions begin canonicalized, and later these "canonicalized" symbols are used to recognize equivalence of these constants.


A process for converting data that has more than one possible representation into a "standard" canonical representation. This can be done to compare different representations for equivalence, to count the number of distinct data structures, to improve the efficiency of various algorithms by eliminating repeated calculations, or to make it possible to impose a meaningful sorting order.

This means that const expressions like const Foo(1, 1) can represent any usable form that is useful for comparison in virtual machine.

The VM only needs to take into account the value type and arguments in the order in which they occur in this const expression. And, of course, they are reduced for optimization.

Constants with the same canonicalized values:

var foo1 = const Foo(1, 1); // #Foo#int#1#int#1
var foo2 = const Foo(1, 1); // #Foo#int#1#int#1
Constants with different canonicalized values (because signatures differ):

var foo3 = const Foo(1, 2); // $Foo$int$1$int$2
var foo4 = const Foo(1, 3); // $Foo$int$1$int$3

var baz1 = const Baz(const Foo(1, 1), "hello"); // $Baz$Foo$int$1$int$1$String$hello
var baz2 = const Baz(const Foo(1, 1), "hello"); // $Baz$Foo$int$1$int$1$String$hello
Constants are not recreated each time. They are canonicalized at compile time and stored in special lookup tables (where they are hashed by their canonical signatures) from which they are later reused.


The form #Foo#int#1#int#1 used in these samples is only used for comparison purposes and it is not a real form of canonicalization (representation) in Dart VM;

But the real canonicalization form must be "standard" canonical representation.

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Flutter Constructor

By Attractive AddaxAttractive Addax on Sep 03, 2020
Customer(String name, int age, String location) {
  this.name = name;
  this.age = age;
  this.location = location;

Customer(this.name, this.age) {
  this.name = name;
  this.age = age;

Source: bezkoder.com

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dart ?? operator

By Faithful FalconFaithful Falcon on Jun 12, 2020
int val1;
final int val2 = 20;

console.log(val1 ?? val2); //result => 20 because val1 is null


final int val1 = 30;
final int val2 = 20;

console.log(val1 ?? val2); //result => 30 because val1 is not null

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with keyword in dart

By Nervous NarwhalNervous Narwhal on Dec 14, 2020
mixin Human {
  String name;
  int age;

  void about();

class Doctor with Human {
  String specialization;
  Doctor(String doctorName, int doctorAge, String specialization) {
    name = doctorName;
    age = doctorAge;
    this.specialization = specialization;

  void about() {
    print('$name is $age years old. He is $specialization specialist.');

void main() {
  Doctor doctor = Doctor("Harish Chandra", 54, 'child');

Source: stackoverflow.com

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