[Solved] How to combine values in the array? [closed]

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You’d get the spans and map back the text content

var text = [].map.call(document.querySelectorAll('.topics span'), function(elem) {
  return elem.textContent; // or elem.dataset.value for the data-attribute
});

console.log(text)
<div class="topics">
  <span class="topic" data-value="hello">hello</span>
  <span class="topic" data-value="world">world</span>
  <span class="topic" data-value="one">one</span>
  <span class="topic" data-value="two">two</span>
  <span class="topic" data-value="six">six</span>
</div>

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solved How to combine values in the array? [closed]