The opposite of `read` is `show`.

    Prelude&gt; show 3
    &quot;3&quot;

    Prelude&gt; read $ show 3 :: Int
    3

Anyone who is just starting with Haskell and trying to print an Int, use:

    module Lib
        ( someFunc
        ) where
    
    someFunc :: IO ()
    x = 123
    someFunc = putStrLn (show x)

An example based on Chuck&#39;s answer:

    myIntToStr :: Int -&gt; String
    myIntToStr x
        | x &lt; 3     = show x ++ &quot; is less than three&quot;
        | otherwise = &quot;normal&quot;

Note that without the `show` the third line will not compile.

You can use show:

    show 3

What I want to add is that the type signature of show is the following:

    show :: a -&gt; String

And can turn lots of values into string not only type `Int`. 

For example:

    show [1,2,3] 

Here is a reference:

https://hackage.haskell.org/package/base-4.14.1.0/docs/GHC-Show.html#v:show


I was wondering if I could clear up the console with some command..

`console.log()`, can print... is there a command to clear up console?..

I&#39;ve tried to `console.log(console);` and got this functions below... 

    assert: function assert() { [native code] }
    constructor: function Console() { [native code] }
    count: function count() { [native code] }
    debug: function debug() { [native code] }
    dir: function dir() { [native code] }
    dirxml: function dirxml() { [native code] }
    error: function error() { [native code] }
    group: function group() { [native code] }
    groupEnd: function groupEnd() { [native code] }
    info: function info() { [native code] }
    log: function log() { [native code] }
    markTimeline: function markTimeline() { [native code] }
    profile: function profile() { [native code] }
    profileEnd: function profileEnd() { [native code] }
    time: function time() { [native code] }
    timeEnd: function timeEnd() { [native code] }
    trace: function trace() { [native code] }
    warn: function warn() { [native code] }
    __proto__: Object


[ I guess there&#39;s no way to clear up the console... but I wanted someone to say it to me... ]

clear javascript console in Google Chrome

So I want to iterate for each character in a string.

So I thought:

    for (char c : &quot;xyz&quot;)

but I get a compiler error:

    MyClass.java:20: foreach not applicable to expression type

How can I do this?

How do I apply the for-each loop to every character in a String?

I know you can convert a `String` to an number with `read`:

    Prelude&gt; read &quot;3&quot; :: Int
    3
    Prelude&gt; read &quot;3&quot; :: Double 
    3.0

But how do you grab the `String` representation of an `Int` value?

Haskell: Converting Int to String

I know you can convert a <code>String</code> to an number with <code>read</code>:
<pre><code class="hljs language-shell">Prelude> read "3" :: Int
3
Prelude> read "3" :: Double 
3.0
</code></pre>
But how do you grab the <code>String</code> representation of an <code>Int</code> value?

I want to take a string like this: &#39;this-is-a-string&#39; and convert it to this: &#39;thisIsAString&#39;:

    function dashesToCamelCase($string, $capitalizeFirstCharacter = false) {
        // Do stuff

        return $string;
    }

I need to convert &quot;kebab-case&quot; to &quot;camelCase&quot;.

Convert string with dashes to camelCase

I have a Boolean variable which I want to convert to a string:

    $res = true;

I need the converted value to be of the format: `&quot;true&quot; &quot;false&quot;`, not `&quot;0&quot; &quot;1&quot;`

    $converted_res = &quot;true&quot;;
    $converted_res = &quot;false&quot;;

I&#39;ve tried:

    $converted_res = string($res);
    $converted_res = String($res);

But it tells me that `string` and `String` are not recognized functions.  
How do I convert this Boolean to a string in the format of `&quot;true&quot;` or `&quot;false&quot;` in PHP?

How to Convert Boolean to String

I&#39;ve seen questions on how to prefix zeros here in SO. But not the other way!

Can you guys suggest me how to remove the leading zeros in alphanumeric text? Are there any built-in APIs or do I need to write a method to trim the leading zeros?

  Example:

    01234 converts to 1234
    0001234a converts to 1234a
    001234-a converts to 1234-a
    101234 remains as 101234
    2509398 remains as 2509398
    123z remains as 123z
    000002829839 converts to 2829839

How to remove leading zeros from alphanumeric text?

Is there a way in java to create a string with a specified number of a specified character?  In my case, I would need to create a string with 10 spaces.  My current code is:

    StringBuffer outputBuffer = new StringBuffer(length);
    for (int i = 0; i &lt; length; i++){
       outputBuffer.append(&quot; &quot;);
    }
    return outputBuffer.toString();

Is there a better way to accomplish the same thing.  In particular I&#39;d like something that is fast (in terms of execution).


Create a string with n characters

I have texts in UTF-8 with diacritic characters also, and would like to check if first letter of this text is upper case or lower case. How to do this?

How to check if letter is upper or lower in PHP?

I&#39;m trying to define any simple function that spans multiple lines in ghci, take the following as an example:

    let abs n | n &gt;= 0 = n
              | otherwise = -n

So far I&#39;ve tried pressing Enter after the first line:

    Prelude&gt; let abs n | n &gt;= 0 = n
    Prelude&gt;           | otherwise = -n
    &lt;interactive&gt;:1:0: parse error on input `|&#39;

I&#39;ve also attempted to use the `:{` and `:}` commands but I don&#39;t get far:

    Prelude&gt; :{
    unknown command &#39;:{&#39;
    use :? for help.

I&#39;m using GHC Interactive version 6.6 for Haskell 98 on Linux, what am I missing?

How to define a function in ghci across multiple lines?

[Hoogle][1] allows you to search many standard Haskell libraries by either function name, or by approximate type signature. I find it very useful. Is there anything like Hoogle for Scala? Search in [ScalaDoc 2][2] only finds types and packages by name.


  [1]: http://www.haskell.org/hoogle/
  [2]: http://www.scala-lang.org/archives/rc-api/index.html

Scala Hoogle equivalent?

I would like my cabalised program to have a `--version` switch.

I would like it to report the same version as is present in the .cabal file.

If I have to update the version number separately in my Haskell source code as well as in the .cabal file, I will eventually get them out of sync.

So, how can my program, while being compiled under cabal, get its version number from the .cabal file?

How can my Haskell program or library find its version number?

I&#39;ve been thinking of this question very long, but really couldn&#39;t find the answer on Google as well a similar question on Stackoverflow. If there is a duplicate, I&#39;m sorry for that.

A lot of people seem to say that writing compilers and other language tools in functional languages such as OCaml and Haskell is much more efficient and easier then writing them in imperative languages.

Is this true? And if so -- why is it so efficient and easy to write them in functional languages instead of in an imperative language, like C? Also -- isn&#39;t a language tool in a functional language slower then in some low-level language like C?


Why is writing a compiler in a functional language easier?

I have heard that in Haskell, creating a multi-threaded application is as easy as taking a standard Haskell application and compiling it with the `-threaded` flag. Other cases, however, have described the use of a `par` command within the actual source code.

What is the state of Haskell multi-threading? How easy is it to introduce into programs? Is there a good multi-threading tutorial that goes over these different commands and their uses?

How difficult is Haskell multi-threading?

How can I convert an `int` datatype into a `string` datatype in C#?

Convert int to string?

In Haskell, what is the difference between an `Int` and an `Integer`? Where is the answer documented?

What is the difference between Int and Integer?

I think the maximum integer in python is available by calling `sys.maxint`.

What is the maximum `float` or `long` in Python?

What is the maximum float in Python?

I&#39;m trying to extract a string (which contains an integer) from an array and then use it as an int in a function. I&#39;m trying to convert it to a int using intValue.

Here&#39;s the code I&#39;ve been trying.

      NSArray *_returnedArguments = [serverOutput componentsSeparatedByString:@&quot;:&quot;];
      [_appDelegate loggedIn:usernameField.text:passwordField.text:(int)[[_returnedArguments objectAtIndex:2] intValue]];

I get this error:

&gt; passing argument 3 of &#39;loggedIn:::&#39; makes pointer from integer
&gt; without a cast

What&#39;s wrong?

ObjectiveC Parse Integer from String

What is the most accepted way to convert a `boolean` to an `int` in Java?

Convert boolean to int in Java

While trying to learn [Unity][1], I keep seeing the following code for overriding `GetControllerInstance` in MVC:

    if(!typeof(IController).IsAssignableFrom(controllerType)) { ... }

this seems to me a pretty convoluted way of basically writing

    if(controllerType is IController) { ... }

I appreciate there are subtle differences between `is` and `IsAssignableFrom`, ie `IsAssignableFrom` doesn&#39;t include cast conversions, but I&#39;m struggling to understand the implication of this difference in practical scenarios.

When is it imporantant to choose `IsAssignableFrom` over `is`? What difference would it make in the `GetControllerExample`?

    if (!typeof(IController).IsAssignableFrom(controllerType))
          throw new ArgumentException(...);
    return _container.Resolve(controllerType) as IController;
                


  [1]: http://weblogs.asp.net/shijuvarghese/archive/2010/05/07/dependency-injection-in-asp-net-mvc-nerddinner-app-using-unity-2-0.aspx

Use of IsAssignableFrom and &quot;is&quot; keyword in C#

For this code block:

    int num = 5;
    int denom = 7;
    double d = num / denom;

the value of `d` is `0.0`. It can be forced to work by casting:

    double d = ((double) num) / denom;

But is there another way to get the correct `double` result? I don&#39;t like casting primitives, who knows what may happen.

Integer division: How do you produce a double?

Eric Lippert&#39;s comments in [this question](https://stackoverflow.com/questions/3166349/what-is-the-type-in-typeobjectname-var) have left me thoroughly confused. What is the difference between casting and conversion in C#?

What is the difference between casting and conversion?

I am curious to know what the difference is between a cast to say an `int` compared to using `Convert.ToInt32()`. Is there some sort of performance gain with using one?

Also which situations should each be used for? Currently I&#39;m more inclined to use `Convert` but I don&#39;t have a reason to go either way. In my mind I see them both accomplishing the same goal.

When to use a Cast or Convert

How do I convert a byte array into a string?

I have found these functions that do the reverse:

    function string2Bin(s) {
        var b = new Array();
        var last = s.length;
        
        for (var i = 0; i &lt; last; i++) {
            var d = s.charCodeAt(i);
            if (d &lt; 128)
                b[i] = dec2Bin(d);
            else {
                var c = s.charAt(i);
                alert(c + &#39; is NOT an ASCII character&#39;);
                b[i] = -1;
            }
        }
        return b;
    }
    
    function dec2Bin(d) {
        var b = &#39;&#39;;
        
        for (var i = 0; i &lt; 8; i++) {
            b = (d%2) + b;
            d = Math.floor(d/2);
        }
        
        return b;
    }

But how do I get the functions working the other way?

Thanks.

Shao


Content Type	Original Author	Original Content on Stackoverflow
Question	Squirrelsama	View Question on Stackoverflow
Solution 1 - String	Chuck	View Answer on Stackoverflow
Solution 2 - String	Arlind	View Answer on Stackoverflow
Solution 3 - String	prasad_	View Answer on Stackoverflow
Solution 4 - String	Willem van der Veen	View Answer on Stackoverflow

Haskell: Converting Int to String

String Problem Overview

String Solutions

Solution 1 - String

Solution 2 - String

Solution 3 - String

Solution 4 - String

How do I apply the for-each loop to every character in a String?

clear javascript console in Google Chrome

Attributions