title: How to concat javascript array
body: <pre><code>let A = ["u23", "c35",-----so on];
  
  let B = ["123", "234", ---- so on];
  </code></pre>
  
  <p>both a and b indexes count are 100 and same</p>
  
  <p>Expected output <code>C = ["u23,123", "c35,234", ---- so on]</code>;</p>
  
  <p>I need to achieve output in very few steps without using complex steps of for loop.</p>
  
  <p>ECMAScript 6 and above also will be fine.</p>