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To remove a value from a set, use .delete() method: mySet.delete(some_val); This function will return true if the value existed in the set and was removed, or false otherwise.

To check if a given value exists in a set, use .has() method: mySet.has(someVal); Will return true if someVal appears in the set, false otherwise.

One is able to nest one exception / try catch block inside the other. This way one can manage small blocks of code which are capable of working without disrupting your whole mechanism. try { //some code here try { //some thing which throws an exception. For Eg : divide by 0 ...

Hibernate has some strategies of inheritance. The JOINED inheritance type do a JOIN between the child entity and parent entity. The problem with this approach is that Hibernate always bring the data of all involved tables in the inheritance. Per example, if you have the entities Bicycle and Mounta...

System.Threading.Timer - Simplest multithreaded timer. Contains two methods and one constructor. Example: A timer calls the DataWrite method, which writes "multithread executed..." after five seconds have elapsed, and then every second after that until the user presses Enter: using Sys...

A hash is a function that converts a variable length sequence of bytes to a fixed length sequence. Hashing files can be advantageous for many reasons. Hashes can be used to check if two files are identical or verify that the contents of a file haven't been corrupted or changed. You can use hashlib ...

use std::fs::File; use std::io::Read; fn read_a_file() -> std::io::Result<Vec<u8>> { let mut file = try!(File::open("example.data")); let mut data = Vec::new(); try!(file.read_to_end(&mut data)); return Ok(data); } std::io::Result<T>...

The map operation is a useful tool when working with arrays and vectors, but it can also be used to deal with Option values in a functional way. fn main() { // We start with an Option value (Option<i32> in this case). let some_number = Some(9); // Let's do some consecutive ...

1) Form Request Validation You may create a "form request" which can hold the authorization logic, validation rules, and error messages for a particular request in your application. The make:request Artisan CLI command generates the class and places it in the app/Http/Requests director...

public class MainApplication extends Application { private static Context context; //application context private Handler mainThreadHandler; private Toast toast; public Handler getMainThreadHandler() { if (mainThreadHandler == null) { mainThreadHand...

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Exceptions in Laravel are handled by App\Exceptions\Handler.php This file contains two functions by default. Report & Render. We will only be using the first public function report(Exception $e) The report method is used to log exceptions or send them to an external service like BugSnag...

Manual Global Installation For OS X and Linux: Bring up Terminal, Bash, or your normal shell. Type the following into Terminal/Bash: # Download latest stable release using the code below or browse to github.com/drush-ops/drush/releases. php -r "readfile('http://files.drush.org/drus...

Manual installation Type below commands in Terminal. php -r "readfile('http://files.drush.org/drush.phar');" > drush chmod +x drush sudo mv drush /usr/local/bin drush init # Add alias in bash startup file. Composer Assuming composer is installed. composer global require drush/...

One common use for the FOR XML function is to concatenate the values of multiple rows. Here's an example using the Customers table: SELECT STUFF( (SELECT ';' + Email FROM Customers where (Email is not null and Email <> '') ORDER BY Email ASC FOR XM...

Install npm install ts-loader --save-dev Basic webpack.config.js webpack 2.x, 3.x module.exports = { resolve: { extensions: ['.ts', '.tsx', '.js'] }, module: { rules: [ { // Set up ts-loader for .ts/.tsx files and exclude any impor...

A NFA (Nondeterministic Finite Automaton) engine is driven by the pattern. Principle The regex pattern is parsed into a tree. The current position pointer is set to the start of the input string, and a match is attempted at this position. If the match fais, the position is incremented to the ne...

A DFA (Deterministic Finite Automaton) engine is driven by the input. Principle The algorithm scans through the input string once, and remembers all possible paths in the regex which could match. For instance, when an alternation is encountered in the pattern, two new paths are created and attem...

Sometimes we have to resize a UILabel based on dynamic content where the text length is unknown. In this example, width of the UILabel is fixed at 280 points and the height is infinite, lets say 9999. Estimating the frame with respect to the text style and maximumLabelSize. Objective-C UILabel * l...

To create a square, define an element with both a width and height. In the example below, we have an element with a width and height of 100 pixels each. <div class="square"></div> .square { width: 100px; height: 100px; background: rgb(246, 156, 85); } ...