filter unique items from array of objects

filterArrayOfObjects.js

filterUniqueItems(arr) {
        let mymap = new Map(); 
  
        let uniqueItems = arr.filter(el => { 
            const val = mymap.get(el.text); 
            if(val) { 
                if(el.type < val) { 
                    mymap.delete(el.text); 
                    mymap.set(el.text, el.type); 
                    return true; 
                } else { 
                    return false; 
                } 
            } 
            mymap.set(el.text, el.type); 
            return true; 
        });

        return uniqueItems;
    }