ES6: Find an object in an array by one of its properties
I would use some derivative of this:
var arrayFindObjectByProp = (arr, prop, val) => {
return arr.find( obj => obj[prop] == val );
};
newData.find(x => x.investor === investor)
And the whole code:
const originalData = [
{ "investor": "Sue", "value": 5, "investment": "stocks" },
{ "investor": "Rob", "value": 15, "investment": "options" },
{ "investor": "Sue", "value": 25, "investment": "savings" },
{ "investor": "Rob", "value": 15, "investment": "savings" },
{ "investor": "Sue", "value": 2, "investment": "stocks" },
{ "investor": "Liz", "value": 85, "investment": "options" },
{ "investor": "Liz", "value": 16, "investment": "options" },
];
const newData = [
{ "investor": "Sue", "stocks": 0, "options": 0, "savings": 0 },
{ "investor": "Rob", "stocks": 0, "options": 0, "savings": 0 },
{ "investor": "Liz", "stocks": 0, "options": 0, "savings": 0 },
];
for (let {investor, value, investment} of originalData) {
newData.find(x => x.investor === investor)[investment] += value;
}
console.log(newData);.as-console-wrapper.as-console-wrapper { max-height: 100vh }