Tutorial by Examples: g

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// Get the battery API navigator.getBattery().then(function(battery) { // Battery level is between 0 and 1, so we multiply it by 100 to get in percents console.log("Battery level: " + battery.level * 100 + "%"); });

// Get the battery API navigator.getBattery().then(function(battery) { if (battery.charging) { console.log("Battery is charging"); } else { console.log("Battery is discharging"); } });

// Get the battery API navigator.getBattery().then(function(battery) { console.log( "Battery will drain in ", battery.dischargingTime, " seconds" ); });

// Get the battery API navigator.getBattery().then(function(battery) { console.log( "Battery will get fully charged in ", battery.chargingTime, " seconds" ); });

The method PrintWriter.format (called through System.out.format) can be used to print aligned strings in console. The method receives a String with the format information and a series of objects to format: String rowsStrings[] = new String[] {"1", &q...

In the previous example we saw how mixed data types can be inserted into a JSON field. What if we want to update that field? We are going to add scheveningen to the array named variations in the previous example. UPDATE myjson SET dict=JSON_ARRAY_APPEND(dict,'$.variations','schevening...

Clickjacking is a malicious technique of tricking a Web user into clicking on something different from what the user perceives they are clicking on. Learn more To enable clickjacking protection, add the XFrameOptionsMiddleware to your middleware classes. This should already be there if you didn...

In Java (and other languages), using null is a common way of indicating that there is no value attached to a reference variable. In Scala, using Option is preferred over using null. Option wraps values that might be null. None is a subclass of Option wrapping a null reference. Some is a subclass of...

Send a 304 Not Modified response status from the server send in response to a client request that contains headers If-Modified-Since and If-None-Match, if the request resource hasn’t changed. For example if a client request for a web page includes the header If-Modified-Since: Fri, 22 Jul 2016 14:3...

A pointer to a const object can be converted to a pointer to non-const object using the const_cast keyword. Here we use const_cast to call a function that is not const-correct. It only accepts a non-const char* argument even though it never writes through the pointer: void bad_strlen(char*); const...

Vim's standard search commands are / for forward search and ? for backward search. To start a search from normal mode: press /, type your pattern, press <CR> to perform the search. Examples: /foobar<CR> search forward for foobar ?foo\/bar<CR> search backward for ...

In normal mode, move the cursor to any word then press * to search forwards for the next occurrence of the word under the cursor, or press # to search backwards. * or # search for the exact word under the cursor: searching for big would only find big and not bigger. Under the hood, Vim uses a sim...

You can open a new split within Vim with the following commands, in normal mode: Horizontally: :split <file name> :new Vertically: :vsplit <file name> :vnew split will open the file in a new split at the top or left of your screen (or current split.) :sp and :vs are convenie...

ANTLR contains a testing tool in its runtime library, this tool can be used to display information detailing how the parsing is performed to match input against defined rules in your grammar file. To use this tool contained within the ANTLR jar file you should setup your systems classpath to allow ...

Fragments are reusable parts of lexer rules which cannot match on their own - they need to be referenced from a lexer rule. INTEGER: DIGIT+ | '0' [Xx] HEX_DIGIT+ ; fragment DIGIT: [0-9]; fragment HEX_DIGIT: [0-9A-Fa-f];

if we want to change the Controllers directory we need: Move and/or rename the default Controllers directory where we want it. For example from app/Http/Controllers to app/Controllers Update all the namespaces of the files inside the Controllers folder, making they adhere to the new path, re...

There are several ways to insert data: Using the DB Facade public function run() { DB::table('users') ->insert([ 'name' => 'Taylor', 'age' => 21 ]); } Via Instantiating a Model public function run() { $user = new User; $us...

Within your DatabaseSeeder class you are able to call other seeders $this->call(TestSeeder::class) This allows you to keep one file where you can easily find your seeders. Keep in mind that you need to pay attention to the order of your calls regarding foreign key constraints. You can't refe...

Functions within a class can be overloaded for when they are accessed through a cv-qualified reference to that class; this is most commonly used to overload for const, but can be used to overload for volatile and const volatile, too. This is because all non-static member functions take this as a hi...