The basics of Qt Script

To use Qt Script in your programs, you have to enable the script module for your projects by adding the QT += script line to the project file.

Evaluating JavaScript expressions

C++ compilers do not understand JavaScript. Therefore, to execute any script, you need to have a running interpreter that will parse the script and evaluate it. In Qt, this is done with the QScriptEngine class. This is a Qt Script runtime that handles the execution of script code and manages all the resources related to scripts. It provides the evaluate() method, which can be used to execute JavaScript expressions. Let's look at a "Hello World" program in Qt Script:

#include <QCoreApplication>
#include <QScriptEngine>

int main(int argc, char **argv) {
  QCoreApplication app(argc, argv);
  QScriptEngine engine;
  engine.evaluate("print('Hello World!')");
  return 0;
}

This program is very simple. First, it creates an application object that is required...