/**
 * Dynamically creates a new paragraph element, sets its text content and a class, 
 * and then appends it to a specified parent element in the DOM.
 */
function addParagraphToContainer(containerId, textContent, className) {
  const container = document.getElementById(containerId);

  if (container) {
    const newParagraph = document.createElement('p');
    newParagraph.textContent = textContent;
    newParagraph.classList.add(className);
    container.appendChild(newParagraph);
    console.log(`Added new paragraph: "${textContent}" to #${containerId}`);
  } else {
    console.error(`Container with ID "${containerId}" not found.`);
  }
}

// Example Usage (assuming an HTML element with id='myContainer' exists):
// <div id="myContainer"></div>
// addParagraphToContainer('myContainer', 'This is a new paragraph!', 'dynamic-text');