Flatten and sort nested array of object by its array value

// My data is like this  const data = [    {       id: 1,      color: "red",      time: [        { start: new Date("2021-4-3"), end: new Date("2021-4-4") },        { start: new Date("2021-4-2"), end: new Date("2021-4-3") }      ]    },    {      id: 2,      color: "blue",      time: [        { start: new Date("2021-4-2"), end: new Date("2021-4-3") }      ]    }  ]    

And I want to sort time then adjust the data like below.

[    { id: "1-0", start: new Date("2021-4-2"), end: new Date("2021-4-3"), color: "red" },    { id: "1-1", start: new Date("2021-4-3"), end: new Date("2021-4-4"), color: "red" },    { id: "2-0", start: new Date("2021-4-2"), end: new Date("2021-4-3"), color: "blue" },  ]  

I want to know is there have better algorithm to handle this situation? Below is my attempt. (I also attempted ES6 syntax reduce, flatMap and flat, but I can't find the better way to handle this situation.)

let arr = [];  let timeLength = 0;  for (let i = 0; i < data.length; i++) {    timeLength = data[i].time.length;    if (timeLength !== 1) {      data[i].time.sort((a, b) => new Date(a.start) - new Date(b.start)); // sort time    }    for (let j = 0; j < timeLength; j++) {      arr.push({        id: data[i].id + "-" + i,        color: data[i].color,        start: data[i].time[j].start,        end: data[i].time[j].end,      });    }  }  

https://stackoverflow.com/questions/66913907/flatten-and-sort-nested-array-of-object-by-its-array-value April 02, 2021 at 10:57AM