ES6: Find an object in an array by one of its properties

Question

I'm trying to figure out how to do this in ES6...

I have this array of objects..

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"} ]; 

..and this new array of objects where I want to add each person's total value of their investment types (stocks, options, savings)..

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} ]; 

I loop through originalData and save each property of the "current object" in a 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)  } 

Answer 1

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);

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