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[dart/en] updating the dart examples to work against dart 3.0 #4673

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[dart/en] updating the dart examples to work against dart 3.0 #4673

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f6c5e19
updating the dart examples to work against dart 3.0
gochev May 24, 2023
2fa3a11
Merge branch 'master' into master
verhovsky May 16, 2024
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65 changes: 17 additions & 48 deletions dart.html.markdown
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Original file line number Diff line number Diff line change
Expand Up @@ -160,6 +160,8 @@ class Example7Class {
example7() {
Example7Class.sayItFromClass();
new Example7Class().sayItFromInstance();
//the new keyword is optional, so this is the same
Example7Class().sayItFromInstance();
Comment on lines 162 to +164
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Suggested change
new Example7Class().sayItFromInstance();
//the new keyword is optional, so this is the same
Example7Class().sayItFromInstance();
Example7Class().sayItFromInstance();

}

/// Dart supports Generics.
Expand All @@ -175,7 +177,7 @@ example7() {
/// K,V - Key Value(used for Map)
class GenericExample<T>{
void printType(){
print("$T")
print("$T");
}
// methods can also have generics
genericMethod<M>(){
Expand All @@ -200,8 +202,8 @@ class GenericExample<T>{
const example8List = ["Example8 const array"];
const example8Map = {"someKey": "Example8 const map"};
/// Declare List or Maps as Objects.
List<String> explicitList = new List<String>();
Map<String,dynamic> explicitMaps = new Map<String,dynamic>();
List<String> explicitList = <String>[]; //new List<String>() is now
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Suggested change
List<String> explicitList = <String>[]; //new List<String>() is now
List<String> explicitList = <String>[];

I don't understand this comment.

Map<String,dynamic> explicitMaps = <String,dynamic>{};

explicitList.add("SomeArray");
example8() {
Expand All @@ -214,8 +216,8 @@ example8() {
/// So when you assign an existing list to a new variable.
/// Instead of List, it becomes an Iterable
var iterableExplicitList = explicitList;
print(iterableExplicitList) // ("SomeArray"); "[]" becomes "()"
var newExplicitLists = explicitList.toList() // Converts Iterable<E> to List<E>
print(iterableExplicitList); // ("SomeArray"); "[]" becomes "()"
var newExplicitLists = explicitList.toList(); // Converts Iterable<E> to List<E>

/// Loops in Dart take the form of standard for () {} or while () {} loops,
/// slightly more modern for (.. in ..) {}, or functional callbacks with many
Expand Down Expand Up @@ -308,13 +310,13 @@ example13() {

/// Boolean expressions support implicit conversions and dynamic type
example14() {
var a = true;
bool? a = true;
if (a) {
print("true, a is $a");
}
a = false;
if (a) {
print("true, a is $a");
a = null;
if (a ?? false) { //if null count as false
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Suggested change
if (a ?? false) { //if null count as false
if (a ?? false) { // if null count as false

But this could be worded more clearly.

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actually, should just delete this example if "Boolean expressions support implicit conversions" is no longer true?

print("true, a is $a");
} else {
print("false, a is $a"); /// runs here
}
Expand Down Expand Up @@ -416,39 +418,6 @@ example20() {
print("Example20 \$ interpolation ${s1} or $s2 works.");
}

/// Optional types allow for the annotation of APIs and come to the aid of
/// IDEs so the IDEs can better refactor, auto-complete and check for
/// errors. So far we haven't declared any types and the programs have
/// worked just fine. In fact, types are disregarded during runtime.
/// Types can even be wrong and the program will still be given the
/// benefit of the doubt and be run as though the types didn't matter.
/// There's a runtime parameter that checks for type errors which is
/// the checked mode, which is said to be useful during development time,
/// but which is also slower because of the extra checking and is thus
/// avoided during deployment runtime.
class Example21 {
List<String> _names;
Example21() {
_names = ["a", "b"];
}
List<String> get names => _names;
set names(List<String> list) {
_names = list;
}

int get length => _names.length;
void add(String name) {
_names.add(name);
}
}

void example21() {
Example21 o = new Example21();
o.add("c");
print("Example21 names '${o.names}' and length '${o.length}'");
o.names = ["d", "e"];
print("Example21 names '${o.names}' and length '${o.length}'");
}

/// Class inheritance takes the form of class name extends AnotherClassName {}.
class Example22A {
Expand All @@ -470,7 +439,7 @@ example22() {
/// Mixin is mostly used to share methods with distant classes, so the
/// single inheritance doesn't get in the way of reusable code.
/// Mixins follow the "with" statement during the class declaration.
class Example23A {}
mixin class Example23A {}

class Example23Utils {
addTwo(n1, n2) {
Expand All @@ -496,14 +465,14 @@ example23() {
/// super-parent's constructor.
class Example24A {
var _value;
Example24A({value: "someValue"}) {
Example24A({value = "someValue"}) {
_value = value;
}
get value => _value;
}

class Example24B extends Example24A {
Example24B({value: "someOtherValue"}) : super(value: value);
Example24B({value = "someOtherValue"}) : super(value: value);
}

example24() {
Expand Down Expand Up @@ -606,7 +575,7 @@ example29() {
}

rand() {
v = new DM.Random().nextInt(50);
v = new math.Random().nextInt(50);
return v;
}

Expand All @@ -631,7 +600,7 @@ example30() {
top = int.parse("123") ~/ n2,
bottom = 0;
top = top ~/ 6;
gn = new DM.Random().nextInt(top + 1); /// +1 because nextInt top is exclusive
gn = new math.Random().nextInt(top + 1); /// +1 because nextInt top is exclusive
print("Example30 Guess a number between 0 and ${top}");
guessNumber(i) {
if (n == gn) {
Expand Down Expand Up @@ -709,7 +678,7 @@ main() {
example6, example7, example8, example9, example10,
example11, example12, example13, example14, example15,
example16, example17, example18, example19, example20,
example21, example22, example23, example24, example25,
example22, example23, example24, example25,
example26, example27, example28, example29,
example30 // Adding this comment stops the dart formatter from putting all items on a new line
].forEach((ef) => ef());
Expand Down
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