Tutorial by Examples: f

For performance reasons, or due to the existence of mature C libraries, you may want to call C code from a Haskell program. Here is a simple example of how you can pass data to a C library and get an answer back. foo.c: #include <inttypes.h> int32_t foo(int32_t a) { return a+1; } F...

Find div with id="article" and strip out all the inner script tags. #!/usr/bin/env stack -- stack --resolver lts-7.1 --install-ghc runghc --package text --package lens --package taggy-lens --package string-class --package classy-prelude {-# LANGUAGE NoImplicitPrelude #-} {-# LANGUAGE O...

Here is an example of an Azure Powershell automation runbook that deletes any blobs in an Azure storage container that are older than a number of days. This may be useful for removing old SQL backups to save cost and space. It takes a number of parameters which are self explanatory. Note: I have ...

Most examples of a function returning a value involve providing a pointer as one of the arguments to allow the function to modify the value pointed to, similar to the following. The actual return value of the function is usually some type such as an int to indicate the status of the result, whether ...

Often the easiest solution is simply to pass 2D and higher arrays around as flat memory. /* create 2D array with dimensions determined at runtime */ double *matrix = malloc(width * height * sizeof(double)); /* initialise it (for the sake of illustration we want 1.0 on the diagonal) */ int x, y...

UIDevice *deviceInfo = [UIDevice currentDevice]; NSLog(@"Device Name %@", deviceInfo.name); //Ex: myIphone6s NSLog(@"System Name %@", deviceInfo.systemName); //Device Name iPhone OS NSLog(@"System Version %@", deviceInfo.systemVersion); //System Version 9.3...

MULTIPLY 5 BY a MULTIPLY a BY b ON SIZE ERROR PERFORM error-handling NOT ON SIZE ERROR PERFORM who-does-that END-MULTIPLY MULTIPLY a BY b GIVING x ROUNDED MODE IS PROHIBITED y ROUNDED MODE IS NEAREST-EVEN z ROUNDED ...

Create a folder in your project folder, and add your fonts to it. Example: Example: Here we added a folder in root called "mystuff", then "fonts", and inside it we placed our fonts: Add the below code in package.json. { ... "rnpm":...

Inside a Project configuration, you can Create build configuration: Manually Provide a Name and a Description. The Build Configuration ID is generated from the ProjectName, and the Build Configuration Name's. Once your configuraion is Saved, you can specify a Version Control Settings. This will ...

Whenever we want our assembly to install in GAC then it is must to have a strong name. For strong naming assembly we have to create a public key. To generate the .snk file. To create a strong name key file Developers command prompt for VS2015 (with administrator Access) At the command prompt...

bool is a datatype defined in C99. Boolean values are used in conditionals, such as if or while statements, to conditionally perform logic or repeat execution. When evaluating a conditional statement, the value 0 is considered “false”, while any other value is considered “true”. Because NULL ...

Just like in C, Rust raw pointers can point to other raw pointers (which in turn may point to further raw pointers). // Take a regular string slice let planet: &str = "Earth"; // Create a constant pointer pointing to our string slice let planet_ptr: *const &str = &planet ...

Objective-C UIGraphicsBeginImageContext(self.view.frame.size); [[UIImage imageNamed:@"image.png"] drawInRect:self.view.bounds]; UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); self.view.backgroundColor = [UIColor colorWithPatternIma...

Objective-C Just log this see how to use a particular filter NSArray *properties = [CIFilter filterNamesInCategory:kCICategoryBuiltIn]; for (NSString *filterName in properties) { CIFilter *fltr = [CIFilter filterWithName:filterName]; NSLog(@"%@", [fltr a...

Heap sort is a comparison based sorting technique on binary heap data structure. It is similar to selection sort in which we first find the maximum element and put it at the end of the data structure. Then repeat the same process for the remaining items. Pseudo code for Heap Sort: function heapsor...

Note: at is not installed by default on most of modern distributions. To execute a job once at some other time than now, in this example 5pm, you can use echo "somecommand &" | at 5pm If you want to catch the output, you can do that in the usual way: echo "somecommand > o...

malloc() often calls underlying operating system functions to obtain pages of memory. But there is nothing special about the function and it can be implemented in straight C by declaring a large static array and allocating from it (there is a slight difficulty in ensuring correct alignment, in pract...

FullCalendar can be downloaded from it's website: https://fullcalendar.io/download/ from NPM: $ npm install fullcalendar from Bower: $ bower install fullcalendar or CDNJS: //cdnjs.cloudflare.com/ajax/libs/fullcalendar/3.0.1/fullcalendar.min.js //cdnjs.cloudflare.com/ajax/libs/fullca...

IF lv_foo = 3. WRITE: / 'lv_foo is 3'. ELSEIF lv_foo = 5. WRITE: / 'lv_foo is 5'. ELSE. WRITE: / 'lv_foo is neither 3 nor 5'. ENDIF.

Sometimes we want to use a where query on a a collection of records returned which is not ActiveRecord::Relation.Hence we get the above error as Where clause is know to ActiveRecord and not to Array. There is a precise solution for this by using Joins. EXAMPLE:- Suppose i need to find all user ...