I have an array like that
const arr = [ [1, 0], [0, 2], [0, 1], [0, 1] ]
I want to reduce it and get a new array. My aim is getting values of nested array by index. [[index(0)],[index(1)]
const new arr = [ [1,0,0,0] , [0,2,1,1] ]
I tried but I don't understand how i can it.
You can use below code:
const arr = [
{ date: '2024/02/05', price: '1400' },
{ date: '2024/02/06', price: '1400' },
{ date: '2024/02/07', price: '2000' },
{ date: '2024/02/08', price: '2000' },
{ date: '2024/02/09', price: '2000' },
{ date: '2024/02/10', price: '2500' },
{ date: '2024/02/11', price: '2500' }
];
const groupedArr = arr.reduce((acc, obj) => {
const existingItem = acc.find(item => item.price === obj.price);
if (existingItem) {
existingItem.date.push(obj.date);
} else {
acc.push({ price: obj.price, date: [obj.date] });
}
return acc;
}, []);
console.log(groupedArr);
