Below is an example of an array:
let transactions = [{
date: 2019,
amount: 3000
},
{
date: 2019,
amount: 5500
},
{
date: 2020,
amount: 2300
}
]
I am looking to calculate the total amount for each year, resulting in the following:
{"2019": 8500, "2020": 2300}
Any suggestions on how to achieve this?
You can achieve this by utilizing the Array.prototype.reduce method.
let transactions = [{
year: 2018,
amount: 4000
},
{
year: 2018,
amount: 6000
},
{
year: 2019,
amount: 2500
}
];
const result = transactions.reduce((accumulator, current) => {
accumulator[current.year] ? accumulator[current.year] += current.amount : accumulator[current.year] = current.amount;
return accumulator;
}, {});
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