Tutorial by Examples: o

Unary operators act on the object upon which they are called and have high precedence. (See Remarks) When used postfix, the action occurs only after the entire operation is evaluated, leading to some interesting arithmetics: int a = 1; ++a; // result: 2 a--; // result: 1 i...

A common need for random numbers it to generate a number that is X% of some max value. this can be done by treating the result of NextDouble() as a percentage: var rnd = new Random(); var maxValue = 5000; var percentage = rnd.NextDouble(); var result = maxValue * percentage; //suppose NextDoub...

apcu_store can be used to store, apcu_fetch to retrieve values: $key = 'Hello'; $value = 'World'; apcu_store($key, $value); print(apcu_fetch('Hello')); // 'World'

apcu_cache_info provides information about the store and its entries: print_r(apcu_cache_info()); Note that invoking apcu_cache_info() without limit will return the complete data currently stored. To only get the meta data, use apcu_cache_info(true). To get information about certain cache ...

The APCUIterator allows to iterate over entries in the cache: foreach (new APCUIterator() as $entry) { print_r($entry); } The iterator can be initialized with an optional regular expression to select only entries with matching keys: foreach (new APCUIterator($regex) as $entry) { pr...

When creating a std::unique_lock, there are three different locking strategies to choose from: std::try_to_lock, std::defer_lock and std::adopt_lock std::try_to_lock allows for trying a lock without blocking: { std::atomic_int temp {0}; std::mutex _mutex; std::thread t( [&...

/** * Set a custom add to cart URL to redirect to * @return string */ function custom_add_to_cart_redirect() { return 'http://www.yourdomain.com/your-page/'; } add_filter( 'woocommerce_add_to_cart_redirect', 'custom_add_to_cart_redirect' );

std::scoped_lock provides RAII style semantics for owning one more mutexes, combined with the lock avoidance algorithms used by std::lock. When std::scoped_lock is destroyed, mutexes are released in the reverse order from which they where acquired. { std::scoped_lock lock{_mutex1,_mutex2}; ...

Compress-Archive -Path C:\Documents\* -CompressionLevel Optimal -DestinationPath C:\Archives\Documents.zip This command: Compresses all files in C:\Documents Uses Optimal compression Save the resulting archive in C:\Archives\Documents.zip -DestinationPath will add .zipif not present. -Li...

Compress-Archive -Path C:\Documents\* -Update -DestinationPath C:\Archives\Documents.zip this will add or replace all files Documents.zip with the new ones from C:\Documents

index.js var http = require("http"); http.createServer(function(request, response) { response.writeHead(200, {"Content-Type": "text/plain"}); response.write("Heroku world!"); response.end(); }).listen(process.env.PORT); package.json { &quo...

if (Patterns.EMAIL_ADDRESS.matcher(email).matches()){ Log.i("EmailCheck","It is valid"); }

The List interface is implemented by different classes. Each of them has its own way for implementing it with different strategies and providing different pros and cons. Classes implementing List These are all of the public classes in Java SE 8 that implement the java.util.List interface: Abs...

Vertical join appends dataset B to dataset A providing both of them have similar variables. For example, we have sales for the month of Jan'17 in dataset A and sales for Feb'17 in dataset B. To create a dataset C that has sales of both Jan and Feb we use Vertical Join. PROC SQL; CREATE TABLE C AS ...

Inner join creates a dataset that contains records that have matching values from both the tables. For example, we have a dataset A that contains customer information and a dataset B that contains credit card details. To get the credit card details of customers in dataset A, let us create dataset C ...

Left join returns all the observations in the left data set regardless of their key values but only observations with matching key values from the right data set. Considering the same example as above, PROC SQL; CREATE TABLE C AS SELECT A.*, B.CC_NUMBER, B.START_DATE FROM CUSTOMER A LEFT JOIN CC...

Like left join, right join selects all the observations from the right dataset and the matched records from the left table. PROC SQL; CREATE TABLE C AS SELECT A.*, B.CC_NUMBER, B.START_DATE FROM CUSTOMER A RIGHT JOIN CC_DETAILS B ON A.CUSTOMERID=B.CUSTOMERID QUIT; Dataset C contains all the...

Full join selects all the observations from both data sets but there are missing values where the key value in each observation is found in one table only. PROC SQL; CREATE TABLE C AS SELECT A.*, B.CC_NUMBER, B.START_DATE FROM CUSTOMER A FULL JOIN CC_DETAILS B ON A.CUSTOMERID=B.CUSTOMERID QUI...

Many biological questions can be translated into a DNA sequencing problem. For instance, if you want to know the expression level of a gene you can: copy its mRNAs into complementary DNA molecules, sequence each of the resulting DNA molecules, map those sequences back to the reference genome, and th...

Scope is used as the "glue" that we use to communicate between the parent controller, the directive, and the directive template. Whenever the AngularJS application is bootstrapped, a rootScope object is created. Each scope created by controllers, directives and services are prototypically ...