Tutorial by Examples: me

One drawback of creating private method in Javascript is memory-inefficient because a copy of the private method will be created every time a new instance is created. See this simple example. function contact(first, last) { this.firstName = first; this.lastName = last; this.mobile; ...

LINQ extension methods on IEnumerable<T> take actual methods1, whether anonymous methods: //C# Func<int,bool> fn = x => x > 3; var list = new List<int>() {1,2,3,4,5,6}; var query = list.Where(fn); 'VB.NET Dim fn = Function(x As Integer) x > 3 Dim list = New List F...

You can return a list of all the messages in a mailbox using imap_headers. <?php $headers = imap_headers($mailbox); The result is an array of strings with the following pattern: [FLAG] [MESSAGE-ID])[DD-MM-YYY] [FROM ADDRESS] [SUBJECT TRUNCATED TO 25 CHAR] ([SIZE] chars) Here's a sample o...

roslaunch is an important tool that manages the start and stop of ROS nodes. It takes one or more "*.launch" files as arguments. For this example, I will refer to the following (as asked in this question), so how can we execute those commands consecutively & automatically : roscd ste...

Take or pick photos and videos from a cross platform API. Available Nuget : [https://www.nuget.org/packages/Xam.Plugin.Media/][1] XAML <StackLayout Spacing="10" Padding="10"> <Button x:Name="takePhoto" Text="Take Photo"/> <Butto...

Messaging plugin for Xamarin and Windows to make a phone call, send a sms or send an e-mail using the default messaging applications on the different mobile platforms. Available Nuget : [https://www.nuget.org/packages/Xam.Plugins.Messaging/][1] XAML <StackLayout Spacing="10" Padding...

Installation via NodeJS is the recommended method. It is preferred because you can use it to build the files selecting just the components you want. Step 1: Install Node (Link) Step 2: Install Gulp globally ( -g ) on your computer npm install -g gulp Semantic UI uses Gulp to provide command ...

It is important to read the error response that is returned by the Google Analytics API server. In a lot of cases they can tell you exactly what is wrong. 400 invalidParameter { "error": { "errors": [ { "domain": "global", "reason&...

An example implementation of BubbleSort in C++: void bubbleSort(vector<int>numbers) { for(int i = numbers.size() - 1; i >= 0; i--) { for(int j = 1; j <= i; j++) { if(numbers[j-1] > numbers[j]) { swap(numbers[j-1],numbers(...

public class QuickSort { private static int Partition(int[] input, int low, int high) { var pivot = input[high]; var i = low - 1; for (var j = low; j <= high - 1; j++) { if (input[j] <= pivot) { i++; ...

An example of a constraint as expressed in the C standard is having two variables of the same name declared in a scope1), for example: void foo(int bar) { int var; double var; } This code breaches the constraint and must produce a diagnostic message at compile time. This is very usef...

The unary + and - operators are only usable on arithmetic types, therefore if for example one tries to use them on a struct the program will produce a diagnostic eg: struct foo { bool bar; }; void baz(void) { struct foo testStruct; -testStruct; /* This breaks the constraint so mu...

// initialize library $this->load->library('form_validation'); $this->form_validation->set_rules('username', 'Username', 'required|max_length[20]'); // Add validation rules for require and max $this->form_validation->set_rules('password', 'Password', 'required|matches[passw...

The members of a union share the same space in memory. This means that writing to one member overwrites the data in all other members and that reading from one member results in the same data as reading from all other members. However, because union members can have differing types and sizes, the da...

Customizing error messages The /resources/lang/[lang]/validation.php files contain the error messages to be used by the validator. You can edit them as needed. Most of them have placeholders which will be automatically replaced when generating the error message. For example, in 'required' => '...

A palindrome is a word that can be read both ways, like 'kayak'. This example will show how to find if a given word is a palindrome using Python3. First, we need to turn a string into a stack (we will use arrays as stacks). str = "string" stk = [c for c in str] #this makes an array: [&...

public class KnapsackProblem { private static int Knapsack(int w, int[] weight, int[] value, int n) { int i; int[,] k = new int[n + 1, w + 1]; for (i = 0; i <= n; i++) { int b; for (b = 0; b <= w; b++) { ...

You can parse XML from a string or from a XML file 1. From a string $xml_obj = simplexml_load_string($string); 2. From a file $xml_obj = simplexml_load_file('books.xml'); Example of parsing Considering the following XML: <?xml version="1.0" encoding="UTF-8"?> &l...

var x = 5; var str = "if (x == 5) {console.log('z is 42'); z = 42;} else z = 0; "; console.log("z is ", eval(str)); The use of eval is strongly discouraged. See the Remarks section for details.

import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core'; import { CommonModule } from '@angular/common'; import { AboutComponent } from './about.component'; @NgModule({ imports: [ CommonModule ], declarations: [ AboutComponent ], exports: [ AboutComponent ], schemas...