ES6: How to go through an array of object and change one of the items in there

Question

I'm trying to divide one item in array of objects by 1000 and return a new version with calculated value

0: {name: "Mon, 28", from: 10236, to: -0, time: "2019-01-28T18:51:04+01:00"}
1: {name: "Tue, 29", from: 10209, to: -0, time: "2019-01-29T18:51:03+01:00"}
2: {name: "Wed, 30", from: 12088, to: -0, time: "2019-01-30T18:51:01+01:00"}
3: {name: "Thu, 31", from: 10789, to: -0, time: "2019-01-31T18:50:59+01:00"}
4: {name: "Fri, 1", from: 11449, to: -0, time: "2019-02-01T18:50:56+01:00"}
5: {name: "Sat, 2", from: 13404, to: -0, time: "2019-02-02T18:50:48+01:00"}

const data2 = data.map(entry => {
        let rObj = {}
        rObj[entry.key] = entry.name
        rObj[entry.from] = entry.from / 1000
        rObj[entry.to] = entry.to
        rObj[entry.time] = entry.time
        return rObj
        // return entry.from
    })

I expect the result be like

0: {name: "Mon, 28", from: 10.236, to: -0, time: "2019-01-28T18:51:04+01:00"}
1: {name: "Tue, 29", from: 10.209, to: -0, time: "2019-01-29T18:51:03+01:00"}
2: {name: "Wed, 30", from: 12.088, to: -0, time: "2019-01-30T18:51:01+01:00"}
3: {name: "Thu, 31", from: 10.789, to: -0, time: "2019-01-31T18:50:59+01:00"}
4: {name: "Fri, 1", from: 11.449, to: -0, time: "2019-02-01T18:50:56+01:00"}
5: {name: "Sat, 2", from: 13.404, to: -0, time: "2019-02-02T18:50:48+01:00"}

any help would be appreciated.

Answer 1

You can achieve this using map() method of arrays. If you using 0,1,2... as keys i would suggest you to use array instead. Below is example with array

const arr = [{name: "Mon, 28", from: 10236, to: -0, time: "2019-01-28T18:51:04+01:00"},
{name: "Tue, 29", from: 10.209, to: -0, time: "2019-01-29T18:51:03+01:00"},
{name: "Wed, 30", from: 12.088, to: -0, time: "2019-01-30T18:51:01+01:00"},
{name: "Thu, 31", from: 10.789, to: -0, time: "2019-01-31T18:50:59+01:00"},
{name: "Fri, 1", from: 11.449, to: -0, time: "2019-02-01T18:50:56+01:00"},
{name: "Sat, 2", from: 13.404, to: -0, time: "2019-02-02T18:50:48+01:00"}]

const newArr = arr.map(item => ({...item,from:item.from/1000}))
console.log(newArr)