Tengo la siguiente matriz:
let array = [ { date: '2022-06-29', cost: 3.874886 }, { date: '2022-06-28', cost: 3.357631 }, { date: '2022-06-28', cost: 92.24 }, { date: '2022-06-28', cost: 221.47 }, { date: '2022-06-28', cost: 164.8 }, { date: '2022-06-29', cost: 263.58 }, { date: '2022-06-29', cost: 30.19 }, { date: '2022-06-29', cost: 3.72 }, { date: '2022-11-29', cost: 33.19 }, { date: '2022-11-01', cost: 31.72 } ]Estoy tratando de usar el método .reduce para obtener la suma del costo, agrupada por fecha, que se vería así:
[ {date: '2022-06-28', cost: 481.867631}, {date: '2022-06-28', cost: 301.364886}, {date: '2022-11-01', cost: 31.72}, {date: '2022-11-29', cost: 33.19} ]puedes hacer algo como esto
const group = data => Object.values(data.reduce((res, {date, cost}) => { return { ...res, [date]: {date, cost: (res[date] || {cost:0}).cost + cost} } }, {})) const data = [ { date: '2022-06-29', cost: 3.874886 }, { date: '2022-06-28', cost: 3.357631 }, { date: '2022-06-28', cost: 92.24 }, { date: '2022-06-28', cost: 221.47 }, { date: '2022-06-28', cost: 164.8 }, { date: '2022-06-29', cost: 263.58 }, { date: '2022-06-29', cost: 30.19 }, { date: '2022-06-29', cost: 3.72 }, { date: '2022-11-29', cost: 33.19 }, { date: '2022-11-01', cost: 31.72 } ] console.log(group(data)) let array = [ { date: '2022-06-29', cost: 3.874886 }, { date: '2022-06-28', cost: 3.357631 }, { date: '2022-06-28', cost: 92.24 }, { date: '2022-06-28', cost: 221.47 }, { date: '2022-06-28', cost: 164.8 }, { date: '2022-06-29', cost: 263.58 }, { date: '2022-06-29', cost: 30.19 }, { date: '2022-06-29', cost: 3.72 }, { date: '2022-11-29', cost: 33.19 }, { date: '2022-11-01', cost: 31.72 } ] const result = array.reduce((acc, item) => { const itemIndex = acc.findIndex(i => i.date === item.date); if (itemIndex !== -1) { acc[itemIndex].cost += item.cost } else { acc.push(item) } return acc; }, []) console.log(result) [ {date: '2022-06-28', cost: 481.867631}, {date: '2022-06-28', cost: 301.364886}, {date: '2022-11-01', cost: 31.72}, {date: '2022-11-29', cost: 33.19} ]aquí está mi manera de lograr el resultado de su deseo.
let array = [ { date: '2022-06-29', cost: 3.874886 }, { date: '2022-06-28', cost: 3.357631 }, { date: '2022-06-28', cost: 92.24 }, { date: '2022-06-28', cost: 221.47 }, { date: '2022-06-28', cost: 164.8 }, { date: '2022-06-29', cost: 263.58 }, { date: '2022-06-29', cost: 30.19 }, { date: '2022-06-29', cost: 3.72 }, { date: '2022-11-29', cost: 33.19 }, { date: '2022-11-01', cost: 31.72 } ] const newArray = array.reduce((prev, curr) => { const check = prev.findIndex(f => f.date === curr.date); if (check > -1) { prev[check].cost += curr.cost } else { prev.push(curr) } return prev; }, []); console.log(newArray)