[Solved] Calling .parseInt() on something that can’t be parsed – JavaScript

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Since the purpose of the question has become more clear now, an edit:

     var a = ["1", 'car', 2];
     a = a.map(function(element) {
       //check if element is a number and not NaN or empty string
       if (!isNaN(element) && element != "") {
          return parseInt(element, 10);
       }
       else
       {
          return element;
       }
     });

     document.body.textContent = a;

This will traverse your array. Testing if the array element is a number, if so transform the number if possible. I’m using Array.prototype.map for this. Please note that this only filters integers. If you want to filter floats use parseFloat. That will parse integers and floats.

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solved Calling .parseInt() on something that can’t be parsed – JavaScript