Tutorial by Examples: ga

The easiest and quickest way to encode a Haskell data type to JSON with Aeson is using generics. {-# LANGUAGE DeriveGeneric #-} import GHC.Generics import Data.Text import Data.Aeson import Data.ByteString.Lazy First let us create a data type Person: data Person = Person { firstName :...

There are two common ways to encode a POST request body: URL encoding (application/x-www-form-urlencoded) and form data (multipart/form-data). Much of the code is similar, but the way you construct the body data is different. Sending a request using URL encoding Be it you have a server for your s...

Using alarm, user can schedule SIGALARM signal to be raised after specified interval. In case user did not blocked, ignored or specified explicit signal handler for this signal, the default action for this signal will be performed on arrival. Per specification default action for SIGALARM is to termi...

Given a noisy signal: import numpy as np import matplotlib.pyplot as plt np.random.seed(1) x = np.linspace(0,2*np.pi,100) y = np.sin(x) + np.random.random(100) * 0.2 plt.plot(x,y) plt.show() one can smooth it using a Savitzky–Golay filter using the scipy.signal.savgol_filter() method...

When editing text, a common task is to navigate to a particular word on the screen. In these examples we explore how we can navigate to the word updated. For the sake of consistency across the examples, we aim to land on the first letter of the word. Mid-screen jump M$B This approach is quick...

The command :g/apples/y A will yank all lines containing the word apples into the a register, which can be pasted with "ap. Any regular expression can be used. Note the space before the A, and the capitalization of the register letter. If a capital letter is used as the yank register, matc...

The simplest way is to use the Activator class. However, even though Activator performance have been improved since .NET 3.5, using Activator.CreateInstance() is bad option sometimes, due to (relatively) low performance: Test 1, Test 2, Test 3... With Activator class Type type = typeof(BigInteg...

By default, a new class module is a Private class, so it is only available for instantiation and use within the VBProject in which it is defined. You can declare, instantiate and use the class anywhere in the same project: 'Class List has Instancing set to Private 'In any other module in the SAME ...

Function arguments can be passed "By Reference", allowing the function to modify the variable used outside the function: function pluralize(&$word) { if (substr($word, -1) == 'y') { $word = substr($word, 0, -1) . 'ies'; } else { $word .= 's'; } } $w...

An object in PHP contains variables and functions. Objects typically belong to a class, which defines the variables and functions that all objects of this class will contain. The syntax to define a class is: class Shape { public $sides = 0; public function description() { ...

Lists can also be assigned to hash variables. When creating a list that will be assigned to a hash variable, it is recommended to use the fat comma => between keys and values to show their relationship: my %hash = ( foo => 42, bar => 43, baz => 44 ); The => is really only a specia...

The following example creates a unique index on the JobCandidateID column of the HumanResources.JobCandidate table of the AdventureWorks2012 sample database. The example then creates a default full-text catalog, ft. Finally, the example creates a full-text index on the Resume column, using the ft ca...

USE AdventureWorks2012; GO CREATE FULLTEXT CATALOG production_catalog; GO CREATE FULLTEXT INDEX ON Production.ProductReview ( ReviewerName Language 1033, EmailAddress Language 1033, Comments Language 1033 ) KEY INDEX PK_ProductR...

USE AdventureWorks2012; GO CREATE FULLTEXT INDEX ON Production.Document ( Title Language 1033, DocumentSummary Language 1033, Document TYPE COLUMN FileExtension Language 1033 ) KEY INDEX PK_Document_DocumentID ...

Your code can, and often should, throw an exception when something unusual has happened. public void WalkInto(Destination destination) { if (destination.Name == "Mordor") { throw new InvalidOperationException("One does not simply walk into Mordor."); } ...

Opening Generic ASCII Text Files 5.6.0 open my $filehandle, '<', $name_of_file or die "Can't open $name_of_file, $!"; This is the basic idiom for "default" File IO and makes $filehandle a readable input stream of bytes, filtered by a default system-specific decoder, which...

In order for a program to react to a certain signal, other than using default action, custom signal handler can be installed using sigaction. sigaction receives three arguments - signal to act on, pointer to sigaction_t structure which, if not NULL, is describing new behaviour and pointer to sigacti...

You can rename branch in local repository using this command: git branch -m old_name new_name

As a developer, you frequently find yourself dealing with strings that are not created by your own code. These will often be supplied by third party libraries, external systems, or even end users. Validating strings of unclear provenance is considered to be one of the hallmarks of defensive program...

Consider the following struct definitions: struct Foo { my_bool: bool, my_num: isize, my_string: String, } struct Bar (bool, isize, String); struct Baz; Constructing new structure values for these types is straightforward: let foo = Foo { my_bool: true, my_num: 42, my_string: ...