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  <title>Sum of array input example</title>
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  <h1>Sum of array (input style)</h1>
  <pre id=out></pre>
  <script>!function(){var n=function(n){var t=String(n||"").trim();if(!t)return[];var r,e=t.split(/[\s,]+/).filter(Boolean),u=[];for(r=0;r<e.length;r++){var i=Number(e[r]);if(!Number.isFinite(i))return null;u.push(i)}return u}("10 -2 7"),t=[];n?(t.push("Array: "+n.join(" ")),t.push("Sum of the array elements: "+function(n){var t,r=0;for(t=0;t<n.length;t++)r+=n[t];return r}(n))):t.push("Invalid input"),document.getElementById("out").textContent=t.join("\n")}()</script>
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JavaScript Sum of Array — User Input Style (Try It)