Angular 10 TIP: nuova regola "typedef" in TSLint

In Angular 10 è stata aggiunta una nuova regola a TSLint chiamata “typedef” che probabilmente, in fase di migrazione da una versione precedente del framework, potrebbe segnalarvi diversi warning.

#angular #javascript

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Angular 10 TIP: nuova regola "typedef" in TSLint

In Angular 10 è stata aggiunta una nuova regola a TSLint chiamata “typedef” che probabilmente, in fase di migrazione da una versione precedente del framework, potrebbe segnalarvi diversi warning.

#angular #javascript

C++ Typedef Specifier Example | Typedef Tutorial in C++

C++ Typedef keyword stands for “type definition” and is used to declare a new data type explicitly. However, it is to be noted that using a typedef doesn’t allow you to create a new data type from scratch but instead allow you to rename an existing data type.  It means you cannot change the rules/instructions for a specific pre-existing data type, but only its calling name can be changed.

#What is a Datatype in C++

One intention of having types is to make sure that the variables are always used in such a way that they were intended to be used. C and C++ provide several built-in  data types that are based on the underlying representation of the data.

#c++ #typedef

Typedef in C Programming | Learn typedef in C

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In C Standard, there are four basic data types. These data types are int, char, float, and double.

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#c #programming-c

An introduction to the typedef keyword in C

The typedef keyword in C allows you to defined new types.

Starting from the built-in C types, we can create our own types, using this syntax:

typedef existingtype NEWTYPE

The new type we create is usually, by convention, uppercase.

This it to distinguish it more easily, and immediately recognize it as type.

#c #c# #c++ #programming-c

Explore TypeDef In Dart & Fluter for Beginners

In this blog, we will Explore TypeDef In Dart &Fluter. It tells you the best way to make and utilize typedef in Dart. It likewise works in Flutter and there’s a utilization example in your flutter applications. This article discloses how to make typedefs for function and non-function and how to utilize the made typedefs.

How to Using typedef for Functions:

typedef IntOperation<int> = int Function(int a, int b);

int processTwoInts (IntOperation<int> intOperation, int a, int b) {
  return intOperation(a, b);
}

class MyClass {

  IntOperation<int> intOperation;

  MyClass(this.intOperation);

  int doIntOperation(int a, int b) {
    return this.intOperation(a, b);
  }
}

void main() {
  IntOperation<int> sumTwoNumbers = (int a, int b) => a + b;
  print(sumTwoNumbers(2, 2));

  print(processTwoInts(sumTwoNumbers, 2, 1));

  MyClass myClass = MyClass(sumTwoNumbers);
  print(myClass.doIntOperation(4, 4));
}

Output:

4
3
8

 

typedef Compare<T> = bool Function(T a, T b);
bool compareAsc(int a, int b) => a < b;
int compareAsc2(int a, int b) => a - b;

bool doComparison<T>(Compare<T> compare, T a, T b) {
  assert(compare is Compare<T>);
  return compare(a, b);
}

void main() {
  print(compareAsc is Compare<int>);
  print(compareAsc2 is Compare<int>);

  doComparison(compareAsc, 1, 2);
  doComparison(compareAsc2, 1, 2); 
}

Output:

true
false
true

 

int processTwoInts (int Function(int a, int b) intOperation, int a, int b) {
  return intOperation(a, b);
}

class MyClass {

  int Function(int a, int b) intOperation;

  MyClass(this.intOperation);

  int doIntOperation(int a, int b) {
    return this.intOperation(a, b);
  }
}

void main() {
  int Function(int a, int b) sumTwoNumbers = (int a, int b) => a + b;
  print(sumTwoNumbers(2, 2));

  print(processTwoInts(sumTwoNumbers, 2, 1));

  MyClass myClass = MyClass(sumTwoNumbers);
  print(myClass.doIntOperation(4, 4));
}

 

Using typedef for Non-Functions:

environment:
sdk: '>=2.13.0 <3.0.0'

typedef DataList = List<int>;

void main() {
  DataList data = [50, 60];
  data.add(100);
  print('length: ${data.length}');
  print('values: $data');
  print('type: ${data.runtimeType}');
}

length: 3
values: [50,60,100]
type: List<int>

typedef DataList = List<int>;

class MyClass {

  DataList currentData;

  MyClass({required this.currentData});

  set data(DataList currentData) {
    this.currentData = currentData;
  }

  ScoreList getMultipliedData(int multiplyFactor) {
    DataList result = [];

    currentData.forEach((element) {
      result.add(element * multiplyFactor);
    });

    return result;
  }
}

void main() {
  MyClass myClass = MyClass(currentData: [50, 60, 70]);

  myClass.data = [60, 70];
  print(myClass.currentData);

  print(myClass.getMultipliedData(3));
}

Output:

[70, 90]
[180, 210]

 

typedef RequestBody = Map<String, dynamic>;

void main() {
  final RequestBody requestBody1 = {
    'type': 'BUY',
    'itemId': 2,
    'amount': 200,
  };
  final RequestBody requestBody2 = {
    'type': 'CANCEL_BUY',
    'orderId': '04567835',
  };

  print(requestBody1);
  print(requestBody2);
}

Output:

{type: BUY, itemId: 2, amount: 200}
{type: CANCEL_BUY, orderId: 04567835}

 

typedef NumberList<T> = List<T>;

void main() {
  NumberList<String> numbers = ['1', '2', '3'];
  numbers.add('4');
  print('length: ${numbers.length}');
  print('numbers: $numbers');
  print('type: ${numbers.runtimeType}');
}

Output:

length: 4
numbers: [1, 2, 3, 4]
type: List<String>

 

Usage in Flutter:

import 'package:flutter/material.dart';

typedef WidgetList = List<Widget>;

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: TypedefExample(),
      debugShowCheckedModeBanner: false,
    );
  }
}

class TypedefExample extends StatelessWidget {

  WidgetList buildMethod() {
    return <Widget>[
      const FlutterLogo(size: 60),
      const Text('FlutterDevs.com', style: const TextStyle(color:  Colors.blue, fontSize: 24)),
    ];
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Flutter Demo'),
      ),
      body: SizedBox(
        width: double.infinity,
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: buildMethod(),
        ),
      ),
    );
  }
}

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