I need to create an array that contains all the visits values if the date is the same without creating duplicate date arrays
const MOCK = {
data: [
{date: "Aug.03", name: "Nihal Pandit", visits: 3 },
{date: "Aug.03", name: "Anthony Elias", visits: 3 },
{date: "Aug.04", name: "Alex P.", visits: 2 },
{date: "Aug.05", name: "Alex P.", visits: 3 },
{date: "Aug.05", name: "Anthony Elias", visits: 3 },
]
}
But im not sure of a method that lets you compare the values from one iteration to another when looping over an array. I think Array.reduce() might work, but I dont understand how to properly use reduce at this point.
I am looking for a result that looks like:
[["Aug.03", 3, 3], ["Aug.04",2],["Aug.05", 2, 3]
So I need an array for each date (the array should contain that date) and all the visit values from every object that contains that date.
let newArray = []
let visitCountValues = MOCK?.data?.map((item, idx)=> {
let value = Object.values(item);
if(value[0] === value[0]){
newArray.push([value[0], value[1])
}
})
after you update you question I understood better you can do something like this
const visits = [
{date: "Aug.03", name: "Nihal Pandit", visits: 3 },
{date: "Aug.03", name: "Anthony Elias", visits: 3 },
{date: "Aug.04", name: "Alex P.", visits: 2 },
{date: "Aug.05", name: "Alex P.", visits: 3 },
{date: "Aug.05", name: "Anthony Elias", visits: 3 },
]
const result = Object.values(visits.reduce((res, {date, visits}) =>{
const existing = res[date] || [date]
res[date] = [...existing, visits]
return res
}, {}))
console.log(result)You can use reduce to group the array on one objectwithdateas property, andObject.valuesto get themapped` arrays.
const MOCK = {
data: [
{date: "Aug.03", name: "Nihal Pandit", visits: 3 },
{date: "Aug.03", name: "Anthony Elias", visits: 3 },
{date: "Aug.04", name: "Alex P.", visits: 2 },
{date: "Aug.05", name: "Alex P.", visits: 3 },
{date: "Aug.05", name: "Anthony Elias", visits: 3 },
]
}
const dateGroups = Object.values(MOCK.data.reduce((acc, { date, visits }) => ({
...acc,
[date]: [...(acc[date] || [date]), visits]
}), {}))
console.log(dateGroups)