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  <title>JS Alphabet Pattern 21 - Try It</title>
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  <h1>Alphabet diamond with stars</h1>
  <p>Edit <code>top</code> or replace <code>*</code>, then click Run.</p>
  <pre id=output></pre>
  <script>(()=>{let t="";for(let e=1;e<=5;e++){let o="";for(let t=1;t<2*e;t++)o+=t%2==0?"*":String.fromCharCode(e+64);t+=o+"\n"}for(let e=4;e>=1;e--){let o="";for(let t=1;t<2*e;t++)o+=t%2==0?"*":String.fromCharCode(e+64);t+=o+"\n"}document.getElementById("output").textContent=t})()</script>
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JavaScript Alphabet Pattern 21 (Try It)