は、私は、このデータセットを持っているのJavascript

Question

内のオブジェクトの配列の属性を組み合わせる：

var dataset = [ 
{time: "t1", val1: 0, val2: 0, val3: 1}, 
{time: "t2", val1: 0, val2: 0, val3: 4}, 
{time: "t3", val1: 1, val2: 0, val3: 0}, 
{time: "t4", val1: 3, val2: 0, val3: 0}, 
{time: "t2", val1: 0, val2: 3, val3: 0}, 
{time: "t4", val1: 0, val2: 2, val3: 0}, 
{time: "t5", val1: 2, val2: 0, val3: 0}, 

.... 
]; 

私はユニーク時間エントリにデータセットを減らすだけでなく、タイムステップごとの値を結合したいです。結果は次のようになります。

var dataset = [ 
{time: "t1", val1: 0, val2: 0, val3: 1}, 
{time: "t2", val1: 0, val2: 3, val3: 4}, 
{time: "t3", val1: 1, val2: 0, val3: 0}, 
{time: "t4", val1: 3, val2: 2, val3: 0}, 
{time: "t5", val1: 2, val2: 0, val3: 0}, 
.... 
]; 

私は他のSOの記事をもとに減らす（）メソッドでいろいろ書いてみました：それは5つのエントリにデータセットを減らしますが、構造がない

dataset.reduce(function(r,o){ 
var key = o.Date; 
var newObj = o; 
if (r[key] || (r[key]=[])) r[key].push(o); 
    return r; 
}, []); 

console.log(dataset); 

どのように私はそれをしたいと私はオブジェクト値を組み合わせる方法を知らない。

何か助けていただければ幸いです。

Answer 1

Array.reduce()バリエーション：

var dataset = [ 
 
    {time: "t1", val1: 0, val2: 0, val3: 1}, {time: "t2", val1: 0, val2: 0, val3: 4}, 
 
    {time: "t3", val1: 1, val2: 0, val3: 0}, {time: "t4", val1: 3, val2: 0, val3: 0}, 
 
    {time: "t5", val1: 2, val2: 0, val3: 0}, {time: "t2", val1: 0, val2: 3, val3: 0}, 
 
    {time: "t4", val1: 0, val2: 2, val3: 0} 
 
], 
 
result = []; 
 

 
dataset.reduce(function(r, o){ 
 
    var k = o.time; // crucial key (used for grouping entries) 
 
    if (r[k]) { 
 
     r[k].val1 +=o.val1; 
 
     r[k].val2 +=o.val2; 
 
     r[k].val3 +=o.val3; 
 
    } else { 
 
     result.push(o); 
 
     r[k] = o; 
 
    } 
 
    return r; 
 
}, {}); 
 

 
console.log(result);

Answer 2

あなたは

var dataset = [ 
 
{time: "t1", val1: 0, val2: 0, val3: 1}, 
 
{time: "t2", val1: 0, val2: 0, val3: 4}, 
 
{time: "t3", val1: 1, val2: 0, val3: 0}, 
 
{time: "t4", val1: 3, val2: 0, val3: 0}, 
 
{time: "t5", val1: 2, val2: 0, val3: 0}, 
 
{time: "t2", val1: 0, val2: 3, val3: 0}, 
 
{time: "t4", val1: 0, val2: 2, val3: 0} 
 
]; 
 

 
var datasetReduced=[]; 
 

 
dataset.forEach(function(dataItem){ 
 
    var reducedItem = datasetReduced.find(function(element){ 
 
    return element.time === dataItem.time; 
 
    }); 
 
    if(reducedItem){ 
 
    
 
    reducedItem.val1= reducedItem.val1 + dataItem.val1; 
 
    reducedItem.val2= reducedItem.val2 + dataItem.val2; 
 
    reducedItem.val3= reducedItem.val3 + dataItem.val3; 
 
    }else{ 
 
    datasetReduced.push(dataItem); 
 
    } 
 
}); 
 
console.log(datasetReduced);

Answer 3

例のようArray methodsを使用することができますY 3 `t3`オブジェクトおよびそれらの2が、例えば含まがあるだろう

var dataset = [ 
    { time: "t1", val1: 0, val2: 0, val3: 1 }, 
    { time: "t2", val1: 0, val2: 0, val3: 4 }, 
    { time: "t3", val1: 1, val2: 0, val3: 0 }, 
    { time: "t4", val1: 3, val2: 0, val3: 0 }, 
    { time: "t5", val1: 2, val2: 0, val3: 0 }, 
    { time: "t2", val1: 0, val2: 3, val3: 0 }, 
    { time: "t4", val1: 0, val2: 2, val3: 0 }, 
]; 

var newData = dataset.reduce(function (r, o) { 
    if (r.keys[o.time] !== true) { 
     r.data.push(o); 
    } 
    r.keys[o.time] = true; 
    return r; 
}, { data: [], keys: {} }).data; 

console.log(newData); 
//[ { time: 't1', val1: 0, val2: 0, val3: 1 }, 
// { time: 't2', val1: 0, val2: 0, val3: 4 }, 
// { time: 't3', val1: 1, val2: 0, val3: 0 }, 
// { time: 't4', val1: 3, val2: 0, val3: 0 }, 
// { time: 't5', val1: 2, val2: 0, val3: 0 } ]