Javascript's map method simplifies the process of iterating through DOM nodes

While browsing a website, I extracted a table and saved it in an object. As I attempted to loop through the object, I aimed to retrieve specific table cells with a 'tag' within one object. To achieve this, I wrote the following code:

listItems = this.evaluate(function () {
        var nodes = document.querySelectorAll('td');
        return [].map.call(nodes, function(node, index, arr) {
          var userObject = {
            nom: node.innerText,
            prenom: arr[index + 1].innerText
          }
          return userObject;
      });
    });
    

However, when using "Index + 1", it unexpectedly returns Null in some cases.

Answer №1

When referring to the last object index+1 in an array, JavaScript considers it as an invalid index and returns null.

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