Javascript ES6：通过其属性之一在数组中查找对象
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ES6: Find an object in an array by one of its properties
提问by NewToJS
I'm trying to figure out how to do this in ES6...
我想弄清楚如何在 ES6 中做到这一点......
I have this array of objects..
我有这个对象数组..
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)..
..还有这个新的对象数组，我想将每个人的投资类型（股票、期权、储蓄）的总价值相加。
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..
我遍历 originalData 并将“当前对象”的每个属性保存在一个 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)
}
回答by Qwertiy
newData.find(x => x.investor === investor)
And the whole code:
以及整个代码：
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 }回答by W. Nema
I would use some derivative of this:
我会使用这个的一些衍生物：
var arrayFindObjectByProp = (arr, prop, val) => {
return arr.find( obj => obj[prop] == val );
};
