I have an array of objects that is grouped by index and would like to restructure and add labels to the response.
This is my original array:
let cars = [{'make': 'audi', 'model': 'RS3', 'transmition': 'automatic'}, {'make': 'audi', 'model': 'RS7', 'transmition': 'dual-clutch'}, {'make': 'bmw', 'model': '325is', 'transmition': 'manual'}, {'make': 'bmw', 'model': 'M2', 'transmition': 'dual-clutch'}]
Here is the source code used to group the array by make:
var groupedByMake = _.groupBy(
cars,
"make"
);
The response looks like this:
{
'audi':[{'model': 'RS3', 'transmition': 'automatic'}, {'model': 'RS7', 'transmition': 'dual-clutch'}],
'bmw':[{'model': '325is', 'transmition': 'manual'}, {'model': 'M2', 'transmition': 'dual-clutch'}]
}
My desired outcome should look like this:
[{
'make': 'audi',
'types': [{'model': 'RS3', 'transmition': 'automatic'}, {'model': 'RS7', 'transmition': 'dual-clutch'}]
},{
'make': 'bmw',
'types': [{'model': '325is', 'transmition': 'manual'}, {'model': 'M2', 'transmition': 'dual-clutch'}]
}]
Is this possible to achieve using JavaScript? If so can I get assistance to achieve this task.
const cars = [{'make': 'audi', 'model': 'RS3', 'transmition': 'automatic'}, {'make': 'audi', 'model': 'RS7', 'transmition': 'dual-clutch'}, {'make': 'bmw', 'model': '325is', 'transmition': 'manual'}, {'make': 'bmw', 'model': 'M2', 'transmition': 'dual-clutch'}];
const groupBy = (array, key) => {
return array.reduce((acc, item) => {
const keyValue = item[key];
const existingGroup = acc.find((group) => group.key === keyValue);
if (existingGroup) {
existingGroup.items.push(item);
} else {
// remove make from item
const { make, ...rest } = item;
acc.push({ key: keyValue, items: [rest] });
}
return acc;
}, []);
}
console.log(JSON.stringify(groupBy(cars, 'make'), null, 2));You can use array.reduce to turn one array into another one and control whether you return a new element or accumulate values in existing one (prev):
let cars = [{'make': 'audi', 'model': 'RS3', 'transmition': 'automatic'}, {'make': 'audi', 'model': 'RS7', 'transmition': 'dual-clutch'}, {'make': 'bmw', 'model': '325is', 'transmition': 'manual'}, {'make': 'bmw', 'model': 'M2', 'transmition': 'dual-clutch'}];
let output = cars.reduce((acc, cur) => {
let {make, ...obj} = cur;
let prev = acc.find(x => x.make === make);
if(!prev) {
acc.push({make,types:[obj]})
} else {
prev.types.push(obj);
}
return acc;
}, []);
console.log(output);If you want to keep your groupby as-is (using lodash):
// Result from lodash
var groupedByMake = {
'audi':[{'model': 'RS3', 'transmition': 'automatic'}, {'model': 'RS7', 'transmition': 'dual-clutch'}],
'bmw':[{'model': '325is', 'transmition': 'manual'}, {'model': 'M2', 'transmition': 'dual-clutch'}]
}
const result = Object.keys(groupedByMake).map(make => ({make, types: groupedByMake [make]}));
console.log(result);