Tutorial by Examples: n

Function

A function is a unit of code that represents a sequence of statements. Functions can accept arguments or values and return a single value (or not). To use a function, a function call is used on argument values and the use of the function call itself is replaced with its return value. Every functio...

C++ • Getting started with C++

Split (reshape) CSV strings in columns into multiple rows, having one element per row

import pandas as pd df = pd.DataFrame([{'var1': 'a,b,c', 'var2': 1, 'var3': 'XX'}, {'var1': 'd,e,f,x,y', 'var2': 2, 'var3': 'ZZ'}]) print(df) reshaped = \ (df.set_index(df.columns.drop('var1',1).tolist()) .var1.str.split(',', expand=True) .stack() .reset_ind...

pandas • Reshaping and pivoting

MainWindow.h

#ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QMainWindow> namespace Ui { class MainWindow; } class MyCompareFileDialog; class MainWindow : public QMainWindow { Q_OBJECT public: explicit MainWindow(QWidget *parent = 0); ~MainWindow(); private: Ui...

Qt • QDialogs

MainWindow.cpp

#include "mainwindow.h" #include "ui_mainwindow.h" #include "mycomparefiledialog.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); myDialog = new MyCompareFileDialog(this); ...

Qt • QDialogs

main.cpp

#include "mainwindow.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); MainWindow w; w.show(); return a.exec(); }

Qt • QDialogs

mainwindow.ui

<?xml version="1.0" encoding="UTF-8"?> <ui version="4.0"> <class>MainWindow</class> <widget class="QMainWindow" name="MainWindow"> <property name="geometry"> <rect> <x>0</x...

Qt • QDialogs

Consume Liferay JSON service for GET requests

Liferay exposes many default and custom services available to other systems via JSON. To explore services on a particular liferay instance, use a given URL - A local instance in this case: http://localhost:8080/api/jsonws/ Select the required service, consume the service with the given syntax ...

liferay • Using Restful web service in Liferay

Create Immutable version of DateTime from Mutable prior PHP 5.6

To create \DateTimeImmutable in PHP 5.6+ use: \DateTimeImmutable::createFromMutable($concrete); Prior PHP 5.6 you can use: \DateTimeImmutable::createFromFormat(\DateTime::ISO8601, $mutable->format(\DateTime::ISO8601), $mutable->getTimezone());

PHP • Datetime Class

Convert simple JSON object to simple string

var JSONObject = { stringProp: 'stringProp', booleanProp: false, intProp: 8 } var JSONString = JSON.stringify(JSONObject); console.log(JSONString); /* output * {"stringProp":"stringProp","booleanProp":false,"intProp":8} */

JSON • Stringify - Convert JSON to string

Stringify with filter

var JSONObject = { stringProp: 'stringProp', booleanProp: false, intProp: 8 } var JSONString = JSON.stringify(JSONObject, ['intProp']); console.log(JSONString); /* output * {"intProp":8} */

JSON • Stringify - Convert JSON to string

Stringify with white-space

var JSONObject = { stringProp: 'stringProp', booleanProp: false, intProp: 8 } var JSONString = JSON.stringify(JSONObject, null, 2); console.log(JSONString); /* output: * { * "stringProp": "stringProp", * "booleanProp": false, * "...

JSON • Stringify - Convert JSON to string

Loading XML data into simplexml

Loading from string Use simplexml_load_string to create a SimpleXMLElement from a string: $xmlString = "<?xml version='1.0' encoding='UTF-8'?>"; $xml = simplexml_load_string($xmlString) or die("Error: Cannot create object"); Note that or not || must be used here becau...

PHP • SimpleXML

Self-made user-defined literal for binary

Despite you can write a binary number in C++14 like: int number =0b0001'0101; // ==21 here comes a famous example with a self-made implementation for binary numbers: Note: The whole template expanding program is running at compile time. template< char FIRST, char... REST > struct binary {...

C++ • User-Defined Literals

Broadcast Hash Join in Spark

A broadcast join copies the small data to the worker nodes which leads to a highly efficient and super-fast join. When we are joining two datasets and one of the datasets is much smaller than the other (e.g when the small dataset can fit into memory), then we should use a Broadcast Hash Join. The f...

apache-spark • Joins

The Client Script

The Client Script is one of the more commonly used, and complex, script types available to you. As its name implies, the Client Script runs in the browser, i.e. on the client side. It is the only script type that runs on the client side; all others will execute on the server side of NetSuite. The p...