Tutorial by Examples: l

If we would like to limit the access to our app, we could write a middleware for that too! This example only grants you access on thrusdays, but a real world example could, for example, be user authentication. A good place to put this would be after the logging middleware but before any content is s...

std::optional<float> divide(float a, float b) { if (b!=0.f) return a/b; return {}; } Here we return either the fraction a/b, but if it is not defined (would be infinity) we instead return the empty optional. A more complex case: template<class Range, class Pred> auto find_if...

void print_name( std::ostream& os, std::optional<std::string> const& name ) { std::cout "Name is: " << name.value_or("<name missing>") << '\n'; } value_or either returns the value stored in the optional, or the argument if there is nothing s...

If you have loaded a file into GHCi (e.g. using :l filename.hs) and you have changed the file in an editor outside of GHCi you must reload the file with :r or :reload in order to make use of the changes, hence you don't need to type again the filename. ghci> :r OK, modules loaded: Main. ghci...

Launch mode defines the behaviour of new or existing activity in the task. There are possible launch modes: standard singleTop singleTask singleInstance It should be defined in android manifest in <activity/> element as android:launchMode attribute. <activity android:launchM...

A string can be written to a file with an instance of the File class. file = File.new('tmp.txt', 'w') file.write("NaNaNaNa\n") file.write('Batman!\n') file.close The File class also offers a shorthand for the new and close operations with the open method. File.open('tmp.txt', 'w') ...

You can call an instance method using the . special form: (.trim " hello ") ;;=> "hello" You can call instance methods with arguments like this: (.substring "hello" 0 2) ;;=> "he"

You can call an instance field using the .- syntax: (def p (java.awt.Point. 0 1)) (.-x p) ;;=> 0 (.-y p) ;;=> 1

You can call static methods like this: (System/currentTimeMillis) ;;=> 1469493415265 Or pass in arguments, like this: (System/setProperty "foo" "42") ;;=> nil (System/getProperty "foo") ;;=> "42"

You can call a Clojure function from Java code by looking up the function and invoking it: IFn times = Clojure.var("clojure.core", "*"); times.invoke(2, 2); This looks up the * function from the clojure.core namespace and invokes it with the arguments 2 & 2.

The macro() function allows you to add new functionality to Illuminate\Support\Collection objects Usage: Collection::macro("macro_name", function ($parameters) { // Your macro }); For example: Collection::macro('uppercase', function () { return $this->map(function ($i...

Also known as triple equals. This operator does not test equality, but rather tests if the right operand has an IS A relationship with the left operand. As such, the popular name case equality operator is misleading. This SO answer describes it thus: the best way to describe a === b is "if I ...

Goto https://atom.io/ and install the atom editor. Then install some Atom packages for easier Titanium coding: NameTypeFeaturestitanium language javascriptLanguageJS Autocomplete (non alloy)Titanium Alloyadd-onAll-in-one packageJump to definitionOpen relatedTSS HighlightTi-Createadd-onCreate proje...

There are several ways to compile your app. You can use the simulator/emulator, deploy it to your device or create store apk's/ipa's. There is also a live test tool (TiShadow) which saves you a lot of time waiting for the compiler. cli way # android to device ti build -p android -T device # a...

Is the relative path to the file from the current execution directory Assume we have this directory structure: /home/stackoverflow/script.rb script.rb contains: puts __FILE__ If you are inside /home/stackoverflow and execute the script like ruby script.rb then __FILE__ will output script.rb ...

Modules can contain other modules and classes: module Namespace module Child class Foo; end end # module Child # Foo can now be accessed as: # Child::Foo end # module Namespace # Foo must now be accessed as: # Namespace::Child::Foo

This code opens a file for writing. Returns an error if the file couldn't be opened. Also closes the file at the end. #!/usr/bin/perl use strict; use warnings; use open qw( :encoding(UTF-8) :std ); # Make UTF-8 default encoding # Open "output.txt" for writing (">") and ...

The permutation method, when called with a block yields a two dimensional array consisting of all ordered sequences of a collection of numbers. If this method is called without a block, it will return an enumerator. To convert to an array, call the to_a method. ExampleResult[1,2,3].permutation#&lt...

DatabaseTransactions trait allows databases to rollback all the change during the tests. If you want to rollback multiple databases , you need to set $connectionsToTransact properties use Illuminate\Foundation\Testing\DatabaseMigrations; class ExampleTest extends TestCase { use Databas...

let configuration = WKWebViewConfiguration() if let path = NSBundle.mainBundle().pathForResource("customUserScript", ofType: "js"), source = try? NSString(contentsOfFile: path, encoding: NSUTF8StringEncoding) as String { let userScript = WKUserScript(source...