You might be reading some out of date docs (e.g. for Rust 0.9)

As of Rust 1.0, [the way to escape `{` and `}` is with another `{` or `}`][1]

    write!(f, &quot;{{ hash:{}, subject: {} }}&quot;, self.hash, self.subject)

&gt; The literal characters `{` and `}` may be included in a string by
&gt; preceding them with the same character. For example, the `{` character
&gt; is escaped with `{{` and the `}` character is escaped with `}}`.


  [1]: https://doc.rust-lang.org/std/fmt/index.html#escaping

I can have only one project / path opened in in the same time, in one Sublime Text 3 window.

Each time I quickly switch project (`Ctrl+Alt+P`), new project replaces current one. Each time I open new folder (`File &gt; Open Folder...`) or project (`Project &gt; Open Project...`), it is opened in a new Sublime Text window.

Can I have more than one project opened in one Sublime Text 3 window? If yes -- how to achieve this?

More than one folder / project in one Sublime Text 3 window

How do you add custom initializers to `UIViewController` subclasses in Swift?

I&#39;ve created a sub class of `UIViewController` that looks something like this:

    class MyViewController : UIViewController
    {
    	init(leftVC:UIViewController, rightVC:UIViewController, gap:Int)
    	{
    		self.leftVC = leftVC;
    		self.rightVC = rightVC;
    		self.gap = gap;
    		
    		super.init();
    		
    		setupScrollView();
    		setupViewControllers();
    	}
    }

When I run it I get a fatal error:

&gt; fatal error: use of unimplemented initializer &#39;init(nibName:bundle:)&#39; for class &#39;MyApp.MyViewController&#39;

I&#39;ve read elewhere that when adding a custom initializer one has to also override `init(coder aDecoder:NSCoder)` so let&#39;s override that `init` and see what happens:

	override init(coder aDecoder: NSCoder)
	{
		super.init(coder: aDecoder);
	}

If I add this, Xcode complains that `self.leftVC is not initialized at super.init call`. So I guess that can&#39;t be the solution either. So I wonder how can I add custom initializers properly to a `ViewController` subclass in Swift (since in Objective-C this seems not to be a problem)?

Swift: Custom ViewController initializers

I want to write this

    write!(f, &quot;{ hash:{}, subject: {} }&quot;, self.hash, self.subject)

But since curly braces have special meaning for formatting it&#39;s clear that I can&#39;t place the outer curly braces like that without escaping. So I tried to escape them.

    write!(f, &quot;\{ hash:{}, subject: {} \}&quot;, self.hash, self.subject)

Rust doesn&#39;t like that either. Then I read this:

&gt;The literal characters {, }, or # may be included in a string by preceding them with the \ character. Since \ is already an escape character in Rust strings, a string literal using this escape will look like &quot;\\{&quot;.

So I tried

    write!(f, &quot;\\{ hash:{}, subject: {} \\}&quot;, self.hash, self.subject)

But that&#39;s also not working. :-(



How to escape curly braces in a format string in Rust

I want to write this
<pre><code class="hljs language-lua">write!(f, "{ hash:{}, subject: {} }", self.hash, self.subject)
</code></pre>
But since curly braces have special meaning for formatting it's clear that I can't place the outer curly braces like that without escaping. So I tried to escape them.
<pre><code class="hljs language-lua">write!(f, "\{ hash:{}, subject: {} \}", self.hash, self.subject)
</code></pre>
Rust doesn't like that either. Then I read this:
>The literal characters {, }, or # may be included in a string by preceding them with the \ character. Since \ is already an escape character in Rust strings, a string literal using this escape will look like "\{".
So I tried
<pre><code class="hljs language-swift">write!(f, "\\{ hash:{}, subject: {} \\}", self.hash, self.subject)
</code></pre>
But that's also not working. :-(

I have looked at various documentation and similar questions on here, but cannot seem to find the particular solution. Apologies if I have missed anything obvious or have repeated this question!

As a bit of background info, I have implemented 4 graphs using the Chart.js plugin and passed in the required data using PHP from a database. This is all working correctly and is fine. 

My problem is I need to display the data in the tooltips as formatted data aka. as numeric with %. As an example, one of my data from database is -0.17222. I have formatted it as a percentage to display in my table and all is well. However, when setting the data for the chart.js bar graph, the data is obviously missing this formatting and displaying as the -0.17222 which I do not want.

Sorry, I wanted to post a picture, but my reputation is too rubbish!

I grab data from database, then set into my table:

    var kpiRex = new Handsontable(example1, {
        data: getRexData(),

 Then I feed this data like so in the chart section:

    data: kpiRex.getDataAtRow(3)

Any help would be great! I&#39;ve been stuck on this for hours and it&#39;s probably something really simple I am overlooking.

JavaScript Chart.js - Custom data formatting to display on tooltip

I&#39;m formatting my textfiled text once the user start typing the phone number into this format type `0 (555) 444 66 77` and it is working fine but once I get the number from the server I get it like this `05554446677` So please could you tell me how I can edit it in the same format once I get it fro the server?

My code once I start typing:

    func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -&gt; Bool {
        
        if textField == phoneNumberTextField{
            var newString = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string)
            var components = newString.componentsSeparatedByCharactersInSet(NSCharacterSet.decimalDigitCharacterSet().invertedSet)
            
            var decimalString = &quot;&quot;.join(components) as NSString
            var length = decimalString.length
            var hasLeadingOne = length &gt; 0 &amp;&amp; decimalString.characterAtIndex(0) == (1 as unichar)
            
            if length == 0 || (length &gt; 11 &amp;&amp; !hasLeadingOne) || length &gt; 12{
                var newLength = (textField.text as NSString).length + (string as NSString).length - range.length as Int
                
                return (newLength &gt; 11) ? false : true
            }
            var index = 0 as Int
            var formattedString = NSMutableString()
            
            if hasLeadingOne{
                formattedString.appendString(&quot;1 &quot;)
                index += 1
            }
            
            if (length - index) &gt; 1{
                var zeroNumber = decimalString.substringWithRange(NSMakeRange(index, 1))
                formattedString.appendFormat(&quot;%@ &quot;, zeroNumber)
                index += 1
            }
            if (length - index) &gt; 3{
                var areaCode = decimalString.substringWithRange(NSMakeRange(index, 3))
                formattedString.appendFormat(&quot;(%@) &quot;, areaCode)
                index += 3
            }
            if (length - index) &gt; 3{
                var prefix = decimalString.substringWithRange(NSMakeRange(index, 3))
                formattedString.appendFormat(&quot;%@ &quot;, prefix)
                index += 3
            }
            if (length - index) &gt; 3{
                var prefix = decimalString.substringWithRange(NSMakeRange(index, 2))
                formattedString.appendFormat(&quot;%@ &quot;, prefix)
                index += 2
            }
            
            var remainder = decimalString.substringFromIndex(index)
            formattedString.appendString(remainder)
            textField.text = formattedString as String
            return false
        }else{
            return true
        }
    }

Formatting Phone number in Swift

As the title states, what is the difference between these two flags? It seems they both convert the value to a string using repr()?
Also, in this line of code: 

    &quot;{0!r:20}&quot;.format(&quot;Hello&quot;)  
What does the 0 in front of the !r do?

What is the difference between !r and %r in Python?

I am learning to localise my app to Simplified Chinese. I am following [this tutorial][1] on how to do this.

Because the tutorial is based on Obj-C, formatted strings can be written like this:

    &quot;Yesterday you sold %@ apps&quot; = &quot;Ayer le vendi&amp;oacute; %@ aplicaciones&quot;;
&quot;You like?&quot; = &quot;~Es bueno?~&quot;;

But I am using Swift. And in Swift I don&#39;t think you can use `%@` to indicate that there is something to be placed there. We have string interpolation right?

My app is kind of related to maths. And I want to display which input(s) is used to compute the result in a detailed label of a table view cell. For example

    --------------
    1234.5678
    From x, y &lt;---- Here is the detailed label
    --------------

Here, `From x, y` means &quot;The result is computed from x and y&quot;. I want to translate this to Chinese:

    从 x, y 得出

Before, I can just use this:

    &quot;From \(someVariable)&quot;

with the strings file:

    &quot;From&quot; = &quot;从 得出&quot;;

And this is how I would use it in code

    &quot;\(NSLocalizedString(&quot;From&quot;, comment: &quot;&quot;)) \(someVariable)&quot;

But if this were used in the Chinese version, the final string will be like this:

    &quot;从 得出 x, y&quot;

I mean I can put the `从` and `得出` in two different entries in the strings file. But is there a better way to do it?


  [1]: http://www.raywenderlich.com/64401/internationalization-tutorial-for-ios-2014

How to format localised strings in Swift?

I&#39;m trying out Python 3.6. Going through new code, I stumbled upon this new syntax:

    f&quot;My formatting string!&quot;

It seems we can do things like this:

    &gt;&gt;&gt; name = &quot;George&quot;
    &gt;&gt;&gt; print(f&quot;My cool string is called {name}.&quot;)
    My cool string is called George.

Can anyone shed some light on the inner workings of this? In particular what is the scope of the variables that an f-prefixed string can take?

    

String with &#39;f&#39; prefix in python-3.6

I want to apply `filter` on an iterator and I came up with this one and it works, but it&#39;s super verbose:

    .filter(|ref my_struct| match my_struct.my_enum { Unknown =&gt; false, _ =&gt; true })
    
I would rather write something like this:

    .filter(|ref my_struct| my_struct.my_enum != Unknown)

This gives me a compile error

&lt;!-- language: none --&gt;

    binary operation `!=` cannot be applied to type `MyEnum`

Is there an alternative to the verbose pattern matching? I looked for a macro but couldn&#39;t find a suitable one.

How to compare enum without pattern matching

I want the members to be owned by the struct. Sorry for the simple question, but I wasn&#39;t able to find an example. I&#39;m looking for the correct declaration of a struct and instantiation examples.

How to create a Rust struct with string members?

Consider the following code:

    trait Animal {
        fn make_sound(&amp;self) -&gt; String;
    }

    struct Cat;
    impl Animal for Cat {
        fn make_sound(&amp;self) -&gt; String {
            &quot;meow&quot;.to_string()
        }
    }

    struct Dog;
    impl Animal for Dog {
        fn make_sound(&amp;self) -&gt; String {
            &quot;woof&quot;.to_string()
        }
    }

    fn main () {
        let dog: Dog = Dog;
        let cat: Cat = Cat;
        let v: Vec&lt;Animal&gt; = Vec::new();
        v.push(cat);
        v.push(dog);
        for animal in v.iter() {
            println!(&quot;{}&quot;, animal.make_sound());
        }
    }


The compiler tells me that `v` is a vector of `Animal` when I try to push `cat` (type mismatch)

So, how can I make a vector of objects belonging to a trait and calls the corresponding trait method on each element?

Vector of objects belonging to a trait

    struct SemanticDirection;
    
    fn main() {}

&lt;!-- language: none --&gt;

    warning: struct is never used: `SemanticDirection`
     --&gt; src/main.rs:1:1
      |
    1 | struct SemanticDirection;
      | ^^^^^^^^^^^^^^^^^^^^^^^^^
      |
      = note: #[warn(dead_code)] on by default

I will turn these warnings back on for anything serious, but I am just tinkering with the language and this is driving me bats.

I tried adding `#[allow(dead_code)]` to my code, but that did not work.


How to disable unused code warnings in Rust?

I have the following code:

    extern crate rand;
    
    use rand::{thread_rng, Rng};
    
    fn main() {
        let mut vec: Vec&lt;u32&gt; = (0..10).collect();
        let mut slice: &amp;[u32] = vec.as_mut_slice();
    
        thread_rng().shuffle(slice);
    }

and get the following error:

&lt;!-- language: none --&gt;

    error[E0308]: mismatched types
     --&gt; src/main.rs:9:26
      |
    9 |     thread_rng().shuffle(slice);
      |                          ^^^^^ types differ in mutability
      |
      = note: expected type `&amp;mut [_]`
                 found type `&amp;[u32]`

I think I understand that the content of vectors and slices is immutable and that causes the error here, but I&#39;m unsure.

The signature of `as_mut_slice` is `pub fn as_mut_slice&lt;&#39;a&gt;(&amp;&#39;a mut self) -&gt; &amp;&#39;a mut [T]`, so the slice should be mutable, but it somehow isn&#39;t.

I know that there must be an easy fix, but I tried my best and couldn&#39;t get it to work.

Content Type	Original Author	Original Content on Stackoverflow
Question	Christoph	View Question on Stackoverflow
Solution 1 - String Formatting	nos	View Answer on Stackoverflow

How to escape curly braces in a format string in Rust

String Formatting Problem Overview

String Formatting Solutions

Solution 1 - String Formatting

Swift: Custom ViewController initializers

More than one folder / project in one Sublime Text 3 window

Attributions