Is it possible to create filters based on attributes for markers in Leaflet?

Question

I need to create filters based on attributes of markers. I have markers defined this way:

var locations = [    
['AB11 5HW','17','A',57.147701,-2.085442 ] ,
['AB11 8DG','3','B',57.129372,-2.090916 ] ,
];

If the user selects for 'A' or 'B' all markers containing attribute A or B should become visible on the map. Something like

var markersA =  a[2] contains 'A' 

I thought it is maybe possible with Leaflet Marker groups or something similar.

I'm new to Javascript so I'm interested if it's even possible.