Anthony

const arr = [{name: "one", q: 5},{name: "one", q: 3},{name: "two", q: 1},{name: "two", q: 6},{name: "three", q: 10}]
const result = arr.reduce((acc, obj) => { 
   let index = acc.findIndex((elm) => {return elm.name == obj.name});
   if(index == -1){ return acc.concat(Object.assign({}, obj)) };  
   acc[index]['q'] +=  obj.q; 
   return acc 
}, [])