title: Combine 2 array elements with a separator
body: <p>When there are 2 arrays as,</p>
  
  <pre><code>val array1:Array[String] = Array("a", "b", "c", "d")
  val array2:Array[String] = Array("1", "2", "3", "4")
  </code></pre>
  
  <p>Is it possible to merge these 2 arrays as,</p>
  
  <pre><code>val newArray:Array[String] = Array("a:1", "b:2", "c:3", "d:4")
  </code></pre>