I am trying to format the grouped data that I got from JSON but having trouble doing that.
This is my array of objects:
arr = [
{
"date": "2020-01-01",
"metric": 32,
"type": "Google"
},
{
"date": "2020-01-01",
"metric": 24,
"type": "Bing"
},
{
"date": "2020-01-02",
"metric": 1,
"type": "Google"
},
{
"date": "2020-01-02",
"metric": 32,
"type": "Jeeves"
},
{
"date": "2020-01-03",
"metric": 24,
"type": "Bing"
},
{
"date": "2020-01-03",
"metric": 30,
"type": "Google"
}
]
I want to group all the metrics by date. So I did this:
const groupBy = (array, key) => {
return array.reduce((result, currentValue) => {
(result[currentValue[key]] = result[currentValue[key]] || []).push(currentValue);
return result;
}, {});
};
const personGroupedByColor = groupBy(arr, 'date');
When I do this:
2020-01-01:
0: {date: "2020-01-01", metric: 32, type: "Google"}
1: {date: "2020-01-01", metric: 24, type: "Bing"}
2020-01-02:
0: {date: "2020-01-02", metric: 1, type: "Google"}
1: {date: "2020-01-02", metric: 32, type: "Jeeves"}
2020-01-03:
0: {date: "2020-01-03", metric: 24, type: "Bing"}
1: {date: "2020-01-03", metric: 30, type: "Google"}
Is there any way for me to format the data to look like so:
{"date_val": "2020-01-01", "metric_name": [32, 24]}
{"date_val": "2020-01-02", "metric_name": [1, 32]}
{"date_val": "2020-01-03", "metric_name": [24, 30]}
How can I format it to look like this? My data is dynamic so I want to be able to hardcode as less as possible.
You could reduce() the array and check if a given date is already in the accumulator, if so, push the current date to it, otherwise create a new object with that date in the array:
arr = [{
date: "2020-01-01",
metric: 32,
type: "Google",
},
{
date: "2020-01-01",
metric: 24,
type: "Bing",
},
{
date: "2020-01-02",
metric: 1,
type: "Google",
},
{
date: "2020-01-02",
metric: 32,
type: "Jeeves",
},
{
date: "2020-01-03",
metric: 24,
type: "Bing",
},
{
date: "2020-01-03",
metric: 30,
type: "Google",
},
];
let result = arr.reduce((p, c) => {
let match = p.find(o => o.date_val === c.date);
if (match) {
match.metric_name.push(c.metric)
} else {
p.push({
date_val: c.date,
metric_name: [c.metric],
});
}
return p;
}, []);
console.log(result);
You can use array.reduce and dynamically evaluate result keys based on specified fields:
let arr = [
{
"date": "2020-01-01",
"metric": 32,
"type": "Google"
},
{
"date": "2020-01-01",
"metric": 24,
"type": "Bing"
},
{
"date": "2020-01-02",
"metric": 1,
"type": "Google"
},
{
"date": "2020-01-02",
"metric": 32,
"type": "Jeeves"
},
{
"date": "2020-01-03",
"metric": 24,
"type": "Bing"
},
{
"date": "2020-01-03",
"metric": 30,
"type": "Google"
}
];
let group = (arr, val, name) => arr.reduce((acc, curr) => {
let valKey = val +"_val";
let nameKey = name + "_name";
let valValue = curr[val];
let nameValue = curr[name];
let existing = acc.find(x => x[valKey] === valValue);
if(existing){
existing[nameKey].push(nameValue);
} else {
acc.push({[valKey]: valValue, [nameKey]: [nameValue]})
}
return acc;
}, []);
console.log(group(arr, 'date', 'metric'))