Estoy tratando de descubrir cómo hacer esto en ES6 ...

Tengo este conjunto de objetos ...

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"}
];

... y esta nueva gama de objetos donde quiero agregar el valor total de cada persona de sus tipos de inversión (acciones, opciones, ahorros) ...

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}
];

Recorro originalData y guardo cada propiedad del "objeto actual" en un let ..

for (let obj of originalData) {
   let currinvestor = obj.investor;
   let currinvestment = obj.investment;
   let currvalue = obj.value;

   ..but here I want to find the obect in newData that has the property = currinvestor (for the "investor" key)
   ...then add that investment type's (currinvestment) value (currvalue) 
}