Tutorial by Examples: g

Three different methods of insertion can used with sets. First, a simple insert of the value. This method returns a pair allowing the caller to check whether the insert really occurred. Second, an insert by giving a hint of where the value will be inserted. The objective is to optimize the inser...

All the insertion methods from sets also apply to multisets. Nevertheless, another possibility exists, which is providing an initializer_list: auto il = { 7, 5, 12 }; std::multiset<int> msut; msut.insert(il);

set and multiset have default compare methods, but in some cases you may need to overload them. Let's imagine we are storing string values in a set, but we know those strings contain only numeric values. By default the sort will be a lexicographical string comparison, so the order won't match the n...

There are several ways to search a given value in std::set or in std::multiset: To get the iterator of the first occurrence of a key, the find() function can be used. It returns end() if the key does not exist. std::set<int> sut; sut.insert(10); sut.insert(15); sut.insert(22); ...

The most obvious method, if you just want to reset your set/multiset to an empty one, is to use clear: std::set<int> sut; sut.insert(10); sut.insert(15); sut.insert(22); sut.insert(3); sut.clear(); //size of sut is 0 Then the erase method can be used.  It offers some poss...

Imagine you're testing code that makes a call to this interface, and you want to make sure your retry code is working. public interface DataStore { void save(Data data) throws IOException; } You could do something like this: public void saveChanges_Retries_WhenDataStoreCallFails() { ...

Adding dependcy To use a gruntplugin, you first need to add it as a dependency to your project. Let's use the jshint plugin as an example. npm install grunt-contrib-jshint --save-dev The --save-dev option is used to add the plugin in the package.json, this way the plugin is always installed aft...

For those of you that are new to programming in Swift and those of you coming from different programming bases, such as Python or Java, this article should be quite helpful. In this post, we will discuss a simple solution for implementing swift algorithms. Fizz Buzz You may have seen Fizz Buzz wri...

Let's explore an example Transaction search where we define a filter for a single transaction's internal ID: We've specified a filter to only show us results for the Transaction with the internal ID of 875; here is that Transaction: We can see it is a Sales Order with a single line item. Beca...

When we only want one result per transaction, that means we only want the Body, or Main Line, of each transaction. To accomplish this, there is a filter named "Main Line". By setting the Main Line filter to Yes in our search criteria, we are essentially saying "Only show me body-leve...

Recall that every transaction contains multiple sublists of data. Now that we can show only sublist data using Main Line, we can further refine our search results to specific sublist data. Most of the sublists included in Transaction results have a corresponding search filter to toggle whether they...

Recoding missing values Regularly, missing data isn't coded as NA in datasets. In SPSS for example, missing values are often represented by the value 99. num.vec <- c(1, 2, 3, 99, 5) num.vec ## [1] 1 2 3 99 5 It is possible to directly assign NA using subsetting num.vec[num.vec == 99]...

npm install --save mongodb npm install --save mongoose //A simple wrapper for ease of development In your server file (normally named index.js or server.js) const express = require('express'); const mongodb = require('mongodb'); const mongoose = require('mongoose'); const mongoConnectString...

const Schema = mongoose.Schema; const ObjectId = Schema.Types.ObjectId; const Article = new Schema({ title: { type: String, unique: true, required: [true, 'Article must have title'] }, author: { type: ObjectId, ref: 'User' } }); module.exports = mongoose....

A simple GET request. Let's assume the Model from the example above is in the file ./db/models/Article.js. const express = require('express'); const Articles = require('./db/models/Article'); module.exports = function (app) { const routes = express.Router(); routes.get('/articles', (r...

The BigDecimal class contains an internal cache of frequently used numbers e.g. 0 to 10. The BigDecimal.valueOf() methods are provided in preference to constructors with similar type parameters i.e. in the below example a is preferred to b. BigDecimal a = BigDecimal.valueOf(10L); //Returns cached O...

You can create custom dialogs which contains many component and perform many functionality on it. It behaves like second stage on owner stage. In the following example an application that shows person in the main stage tableview and creates a person in a dialog (AddingPersonDialog) prepared. GUIs c...

Making a sequence of HTTP requests has two primary reasons: Requests are depending on each other (the result from one requests is required for a consecutive request). We want to spread server load into multiple requests. 1. Making multiple dependent requests This can be performed usi...

Check your current magento version php bin/magento --version Now Add the latest version to your composer. composer require magento/product-community-edition 2.1.6 --no-update Run Composer Update This will ask for the username and password take from your credentials from your marketplace acco...

WITH RECURSIVE t(n) AS ( VALUES (1) UNION ALL SELECT n+1 FROM t WHERE n < 100 ) SELECT sum(n) FROM t; Link to Documentation