How to select a single item in protractor

If you want to get the first element then

element.all(by.css('.dfdf')).first();
element.all(by.css('.dfdf')).get(0);

Try this one. It will work:

element.all(by.css('.dfdf')).get(4).getText();

You can get an indexed element from an array returned with

// Get the 5th element matching the .dfdf css selector
element.all(by.css('.dfdf')).get(4).sendKeys('foo');