[DartPad](https://dartpad.dartlang.org/6e24392642f8934b3e53)



    void main() {
     print(123.toString().padLeft(10, &#39;0&#39;));
    }

Using `NumberFormat` from `import &#39;package:intl/intl.dart&#39;;`

```
NumberFormat formatter = new NumberFormat(&quot;00000000&quot;);

// The following outputs your expected output
debugPrint(&quot;123 should be ${formatter.format(123)}&quot;);
debugPrint(&quot;1243 should be ${formatter.format(1243)}&quot;);
debugPrint(&quot;123456 should be ${formatter.format(123456)}&quot;);
debugPrint(&quot;12345678 should be ${formatter.format(12345678)}&quot;);
```

I have two models, `Post` and `Comment`; many comments belong to a single post. I&#39;m trying to access all comments associated with a post as an array.

I have the following, which gives a collection.

`$comments_collection = $post-&gt;comments()-&gt;get()`

How would I turn this `$comments_collection` into an array? Is there a more direct way of accessing this array through eloquent relationships?

laravel collection to array

I have a significant library of classes written in C++.  I&#39;m trying to make use of them through some type of bridge within Swift rather than rewrite them as Swift code.  The primary motivation is that the C++ code represents a core library that is used on multiple platforms.  Effectively, I&#39;m just creating a Swift based UI to allow the core functionality to work under OS X.

There are other questions asking, &quot;How do I call a C++ function from Swift.&quot;  This is *not* my question.  To bridge to a C++ function, the following works fine:

**Define a bridging header through &quot;C&quot;**

    #ifndef ImageReader_hpp
    #define ImageReader_hpp
    
    #ifdef __cplusplus
    extern &quot;C&quot; {
    #endif
    
        const char *hexdump(char *filename);
        const char *imageType(char *filename);
        
    #ifdef __cplusplus
    }
    #endif
    
    #endif /* ImageReader_hpp */


**Swift code can now call functions directly**

    let type = String.fromCString(imageType(filename))
    let dump = String.fromCString(hexdump(filename))

My question is more specific.  How can I instantiate and manipulate a *C++ Class* from within Swift?  I can&#39;t seem to find anything published on this.

Interacting with C++ classes from Swift

I want to add some leading zeroes to a string. For example, the total length may be eight characters. For example:

    123 should be 00000123
    1243 should be 00001234
    123456 should be 00123456
    12345678 should be 12345678

What is an easy way to do this in Dart?

Add leading zeroes to number in Dart

I want to add some leading zeroes to a string. For example, the total length may be eight characters. For example:
<pre><code class="hljs language-yaml">123 should be 00000123
1243 should be 00001234
123456 should be 00123456
12345678 should be 12345678
</code></pre>
What is an easy way to do this in Dart?

How can I create easily a range of consecutive integers in dart? For example:

    // throws a syntax error :)
    var list = [1..10];

Dart: create a list from 0 to N

In Java when you are defining an enum, you can do something similar to the following, i.e. add members to an `enum`. Is this possible in Dart?

```dart
enum Foo {
  one(1), two(2);
  final num value;
  Foo(this.value);
}
```

How do I add Methods or Values to Enums in Dart?

Let&#39;s assume that an initialization of MyComponent in Dart requires sending an HttpRequest to the server. Is it possible to construct an object synchronously and defer a &#39;real&#39; initialization till the response come back?

In the example below, the _init() function is not called until &quot;done&quot; is printed. Is it possible to fix this?

    import &#39;dart:async&#39;;
    import &#39;dart:io&#39;;

    class MyComponent{
      MyComponent() {
        _init();
      }

      Future _init() async {
        print(&quot;init&quot;);
      }
    }

    void main() {
      var c = new MyComponent();
      sleep(const Duration(seconds: 1));
      print(&quot;done&quot;);
    }

**Output**:
    
    done
    init

Calling an async method from component constructor in Dart

I want to display a **simple `SnackBar` inside Flutter**&#39;s Stateful widget. My application creates new instance of *`MaterialApp`* with a stateful widget called *`MyHomePage`*.

I try to show the **SnackBar** in `showSnackBar()` method. But it fails with *`The method showSnackBar was called on null`*.

What&#39;s wrong with this code?

    class MyApp extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        return new MaterialApp(
          title: &#39;Flutter&#39;,
          theme: new ThemeData(
            primarySwatch: Colors.blue,
          ),
          home: new MyHomePage(),
        );
      }
    }
    
    class MyHomePage extends StatefulWidget {
      MyHomePage({Key key}) : super(key: key);
    
      @override
      _MyHomePageState createState() =&gt; new _MyHomePageState();
    }
    
    class _MyHomePageState extends State&lt;MyHomePage&gt; {
    
      final GlobalKey&lt;ScaffoldState&gt; _scaffoldKey = new GlobalKey&lt;ScaffoldState&gt;();
    
      @override
      void initState() {
        super.initState();
        showInSnackBar(&quot;Some text&quot;);
      }
    
      @override
      Widget build(BuildContext context) {
        return new Padding(
                key: _scaffoldKey,
                padding: const EdgeInsets.all(16.0),
                child: new Text(&quot;Simple Text&quot;)
        );
      }
    
      void showInSnackBar(String value) {
        _scaffoldKey.currentState.showSnackBar(new SnackBar(
            content: new Text(value)
        ));
      }
    }

**SOLUTION:**

    class MyApp extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        return new MaterialApp(
            title: &#39;Flutter&#39;,
            theme: new ThemeData(
                primarySwatch: Colors.blue,
            ),
            home: new Scaffold(body: new MyHomePage()),
          );
      }
    }
    
    class MyHomePage extends StatefulWidget {
      MyHomePage({Key key}) : super(key: key);
    
      @override
      _MyHomePageState createState() =&gt; new _MyHomePageState();
    }
    
    class _MyHomePageState extends State&lt;MyHomePage&gt; {
    
      @override
      void initState() {
        super.initState();
      }
    
      @override
      Widget build(BuildContext context) {
        showInSnackBar(&quot;Some text&quot;);
        return new Padding(
            padding: const EdgeInsets.all(16.0),
            child: new Scaffold(
              body: new Text(&quot;Simple Text&quot;)
            )
        );
      }
    
      void showInSnackBar(String value) {
        Scaffold.of(context).showSnackBar(new SnackBar(
            content: new Text(value)
        ));
      }
    }

Display SnackBar in Flutter

How can I have a line of text with different formatting?

e.g.:

Hello **World**

Content Type	Original Author	Original Content on Stackoverflow
Question	Kasper	View Question on Stackoverflow
Solution 1 - Dart	Günter Zöchbauer	View Answer on Stackoverflow
Solution 2 - Dart	Tom Roggero	View Answer on Stackoverflow

Add leading zeroes to number in Dart

Dart Problem Overview

Dart Solutions

Solution 1 - Dart

Solution 2 - Dart

Interacting with C++ classes from Swift

laravel collection to array

Attributions