Javascript notes

Add item to array if it doesn't exist

// On a page with many .item elements, where each element has many tags .item__tag
// This will create an array 'tagList' that contains all tags (without duplicates)

    var tagList = [];
    $.each( $('.item__tag'), function(i,obj) { 
      nextTag = obj.innerText;
      if ($.inArray(nextTag,tagList) == -1) {
        tagList.push( nextTag );
      }
    } );