Game Programming using Qt 5 Beginner's Guide - Second Edition

Time for action – Executing the strategy scripts

First, we need to check whether the player provided an init function and execute it. We'll do it in the Scene::start() function:

for(int team = 0; team < TEAM_COUNT; team++) {
    QJSValue script = m_teamScripts.value(team);
    if (script.isUndefined()) {
        continue;
    }
    if (!script.hasProperty("init")) {
        continue;
    }
    m_jsEngine.globalObject().setProperty("field", m_sceneProxyValue);
    QJSValue scriptOutput = script.property("init").call();
    if (scriptOutput.isError()) {
        qDebug() << "script error: " << scriptOutput.toString();
        continue;
    }
}

In this code, we use isUndefined() to check whether the code was provided and parsed successfully. Next, we use hasProperty() to check whether the returned object contains ...