function initTutorial()

in src/playground.ts [966:991]

• 23 lines of code
• 6 McCabe index (conditional complexity)

function initTutorial() {
  if (state.tutorial == null || state.tutorial === '' || state.hideText) {
    return;
  }
  // Remove all other text.
  d3.selectAll("article div.l--body").remove();
  let tutorial = d3.select("article").append("div")
    .attr("class", "l--body");
  // Insert tutorial text.
  d3.html(`tutorials/${state.tutorial}.html`, (err, htmlFragment) => {
    if (err) {
      throw err;
    }
    tutorial.node().appendChild(htmlFragment);
    // If the tutorial has a <title> tag, set the page title to that.
    let title = tutorial.select("title");
    if (title.size()) {
      d3.select("header h1").style({
        "margin-top": "20px",
        "margin-bottom": "20px",
      })
      .text(title.text());
      document.title = title.text();
    }
  });
}