Example: Square

The following example defines a function called square which squares the first parameter and returns the result. The function is then invoked via JSAPI and from JavaScript.

#include <iostream>
#include "libjsapi.h"

int main() {
    rs::jsapi::Runtime rt;

    // define a function which squares the first argument and returns the result
    rs::jsapi::Global::DefineFunction(rt, "square",
        [](const std::vector<rs::jsapi::Value>& args, rs::jsapi::Value& result) {
            if (args.size() > 0) {
                result = args[0].toNumber() * args[0].toNumber();
            }
        });

    // call the function via JSAPI
    rs::jsapi::FunctionArguments args(rt);
    args.Append(5);
    rs::jsapi::Value result(rt);
    rt.Call("square", args, result);
    std::cout << result << std::endl;

    // call the function from JavaScript and return the result
    rt.Evaluate("(function(){return square(9);})();", result);
    std::cout << result << std::endl;

    return 0;
}