title: What is ${variable} in javascript
body: <p>I have seen the using of:</p>
  
  <pre><code>${startX} ${startY}
  </code></pre>
  
  <p>in javascript. That is totally new for me. I like the idea to use it, but don't know it is proove.</p>
  
  <pre><code>let cumulativePercent = 0;
  
  function getCoordinatesForPercent(percent) {
    const x = Math.cos(2 * Math.PI * percent);
    const y = Math.sin(2 * Math.PI * percent);
    return [x, y];
  }
  
  const [startX, startY] = getCoordinatesForPercent(cumulativePercent);
  
  const pathData = [
      `M ${startX} ${startY}`, // Move
      `A 1 1 0 ${largeArcFlag} 1 ${endX} ${endY}`, // Arc
      `L 0 0`, // Line
    ].join(' ');
  </code></pre>
  
  <p>I would write it like this:</p>
  
  <pre><code>  const pathData = [
      `M` + startX + ` ` + startY,
      ...
  </code></pre>
  
  <p>Does it works in jQuery also? Thx for any description-link in advance.</p>