shomsky :
I have the following object with arrays as values:
{
A: [{date: 21.01.2020, number: 4000}, {date: 22.01.2020, number: 3800}],
B: [{date: 21.01.2020, number: 4000}, {date: 22.01.2020, number: 3800}],
C: [{date: 21.01.2020, number: 4000}, {date: 22.01.2020, number: 3800}]
}
My goal is to translate this data into an array of objects:
[
{
"date": "21.01.2020",
"A": 4000,
"B": 4000,
"C": 4000
},
{
"date": "22.01.2020",
"A": 3800,
"B": 3800,
"C": 3800
}
]
I understand that I can get the individual keys (A,B,C) from the current object by using:
Object.keys(...)
My problem is that I don't want to map through the current object itself, but I need to map through the values of the current object, the array containing the data that I need (the initial object contains 3 key value pairs, the goal is to transform this into 2 objects).
What would be the best way to map through the values of the object and to create the array?
Sajeeb Ahamed :
You can use this approach by using only forEach. On this method, I first group the data by date and then return the values of the object into an array.
const data = {
A: [{date: '21.01.2020', number: 4000}, {date: '22.01.2020', number: 3800}],
B: [{date: '21.01.2020', number: 4000}, {date: '22.01.2020', number: 3800}],
C: [{date: '21.01.2020', number: 4000}, {date: '22.01.2020', number: 3800}]
};
const res = {};
// Group the data object by the date and make another object
Object.keys(data).forEach(key => {
data[key].forEach(value => {
if (typeof res[value.date] == 'undefined') {
res[value.date] = {};
}
res[value.date].date = value.date;
res[value.date][key] = value.number;
});
});
// Finally make the object as array of object
const output = Object.values(res);
console.log(output);.as-console-wrapper { max-height: 100% !important; top: 0; }Guess you like
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