Tutorial by Examples: re

Over the course of time B-Tree indexes may become fragmented because of updating/deleting/inserting data. In SQLServer terminology we can have internal (index page which is half empty ) and external (logical page order doesn't correspond physical order). Rebuilding index is very similar to dropping...

To find the largest or smallest element stored in a vector, you can use the methods std::max_element and std::min_element, respectively. These methods are defined in <algorithm> header. If several elements are equivalent to the greatest (smallest) element, the methods return the iterator to th...

View components encapsulate reusable pieces of logic and views. They are defined by: A ViewComponent class containing the logic for fetching and preparing the data for the view and deciding which view to render. One or more views Since they contain logic, they are more flexible than partial v...

Let’s try some basic expression in the REPL: CL-USER> (+ 1 2 3) 6 CL-USER> (- 3 1 1) 1 CL-USER> (- 3) -3 CL-USER> (+ 5.3 (- 3 2) (* 2 2)) 10.3 CL-USER> (concatenate 'string "Hello, " "World!") "Hello, World!" CL-USER> The basic building ...

In the example below we use std::string and operator>> to read items from the file. std::ifstream file("file3.txt"); std::vector<std::string> v; std::string s; while(file >> s) // keep reading until we run out { v.push_back(s); ...

C++11 struct info_type { std::string name; int age; float height; // we define an overload of operator>> as a friend function which // gives in privileged access to private data members friend std::istream& operator>>(std::istream& is, info_...

// 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 + "%"); });

DELIMITER $$ DROP PROCEDURE IF EXISTS sp_nested_loop$$ CREATE PROCEDURE sp_nested_loop(IN i INT, IN j INT, OUT x INT, OUT y INT, INOUT z INT) BEGIN DECLARE a INTEGER DEFAULT 0; DECLARE b INTEGER DEFAULT 0; DECLARE c INTEGER DEFAULT 0; WHILE a < i DO WHILE b <...

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 lexer action is a block of arbitrary code in the target language surrounded by {...}, which is executed during matching: IDENTIFIER: [A-Z]+ { log("matched rule"); }; A semantic predicate is a block of arbitrary code in the target language surrounded by {...}?, which evaluates to a bo...

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...

JavaFX 8 The following example demonstrates how to add custom properties that can be styled from css to a custom Node. Here 2 DoublePropertys are added to the Rectangle class to allow setting the width and height from CSS. The following CSS could be used for styling the custom node: StyleableRe...

Objective-C supports a special type called `instancetype that can only be used as type returned by a method. It evaluates to the class of the receiving object. Consider the following class hierarchy: @interface Foo : NSObject - (instancetype)initWithString:(NSString *)string; @end @interf...

You can create and configure build types in the module-level build.gradle file inside the android {} block. android { ... defaultConfig {...} buildTypes { release { minifyEnabled true proguardFiles getDefaultProguar...

Similar to repeaters used in other languages. This binding will allow you to replicate a block of html for each item in an array. <div data-bind="foreach:contacts"> <div class="contact"> <h2 data-bind="text:name"> <p data-bin...

a simple example of how to define a custom shape with 2 inlets and 3 outlets. case class TwoThreeShape[-In1, -In2, +Out1, +Out2, +Out3]( in1: Inlet[In1@uncheckedVariance], in2: Inlet[In2@uncheckedVariance], out1: Outlet[Out1@uncheckedVariance], out2: Ou...

When working with multiple open Workbooks, each of which may have multiple Sheets, it’s safest to define and set reference to all Workbooks and Sheets. Don't rely on ActiveWorkbook or ActiveSheet as they might be changed by the user. The following code example demonstrates how to copy a range from...

Case classes provide a copy method that creates a new object that shares the same fields as the old one, with certain changes. We can use this feature to create a new object from a previous one that has some of the same characteristics. This simple case class to demonstrates this feature: case cla...

To download dependencies, declare the repository so Gradle can find them. To do this, add a repositories { ... } to the app/ module's build.gradle in the top-level file. repositories { // Gradle's Java plugin allows the addition of these two repositories via method calls: jcenter() mavenCe...

You can add remote dependencies in Gradle usign this structure: compile 'group:name:version' or this alternative syntax: compile group: 'xxx', name: 'xxxxx', version: 'xxxx' For example: compile 'com.android.support:appcompat-v7:24.1.0' The compile 'com.android.support:appcompat-v7:24.1....