[英]loop through the objects inside the array and sum it up
我有一个由数据组成的数组,其中每个数据都有多个subData,
var res = [
{
data1:{subData1:56, subData2:0, subData3:45},
data2:{subData2:565, subData3:67, subData4:45},
data3:{subData1:45, subData3:0},
data4:{subData1:32, subData2:0, subData3:47},
data5:{subData1:107, subData2:34, subData3:65},
data6:{subData3:123, subData4:43},
data7:{subData1:432, subData2:67, subData3:78},
data8:{subData4:23, subData5:432, subData6:654},
}
];
我需要获取数组中每个subDatas的总和,我已经找到了解决方案,但是如何减少代码。 请找到以下代码以解决问题,并提出一种更好的优化方法。 我也使用下划线js。
var res = [ { data1:{subData1:56, subData2:0, subData3:45}, data2:{subData2:565, subData3:67, subData4:45}, data3:{subData1:45, subData3:0}, data4:{subData1:32, subData2:0, subData3:47}, data5:{subData1:107, subData2:34, subData3:65}, data6:{subData3:123, subData4:43}, data7:{subData1:432, subData2:67, subData3:78}, data8:{subData4:23, subData5:432, subData6:654}, } ]; var values = Object.values(res[0]) var arrayOfItems = []; var sums = {}; values.map(obj => Object.keys(obj)).map(item => {item.map(subItem => arrayOfItems.push(subItem))}) arrayOfItems = _.uniq(arrayOfItems) _.each(values, function (item) { _.each(arrayOfItems, function (color) { if(sums.hasOwnProperty(color)){ sums[color] = sums[color] + ( item[color] ? item[color] : 0 ) }else{ sums[color] = 0 + (item[color] ? item[color] : 0) } }); }); var arrOfSubDatasTotal = Object.keys(sums).map(item => ({name:item, total:sums[item]})) var totalOfSubDatas = Object.values(sums).reduce((a,b) => a + b) console.log("array Of SubDatas Total =>", arrOfSubDatasTotal) console.log("total Of SubDatas =>", totalOfSubDatas)
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尝试使用Array.reduce , Array.forEach , Array.map , Object.values , Object.entries
逻辑
创建一个键为subData{number}
的对象,并将value作为其 value的总和 。
若要创建对象,请使用Array.reduce
遍历数组中的每个对象,然后使用Object.values
获取该对象中的所有值。 使用Array.forEach
遍历每个值,然后对于每个对象,使用Object.entries
在中间对象中添加/更新条目( 减少accumulator )。
创建对象时,对所有值求和以创建所有subData's
total
。 最后,使用Object.entries
将object
转换为array
然后使用Array.map
将其转换为所需的格式。
var res = [{data1:{subData1:56, subData2:0, subData3:45},data2:{subData2:565, subData3:67, subData4:45},data3:{subData1:45, subData3:0},data4:{subData1:32, subData2:0, subData3:47},data5:{subData1:107, subData2:34, subData3:65},data6:{subData3:123, subData4:43},data7:{subData1:432, subData2:67, subData3:78},data8:{subData4:23, subData5:432, subData6:654}}]; let total = 0; let result = Object.entries( res.reduce((a,c) => { Object.values(c).forEach( o => Object.entries(o).forEach(([k,v]) => { a[k] = (a[k] || 0) + v; total += v; }) ); return a; }, {}) ).map(([k,v]) => ({name: k, total : v})); console.log(result); console.log(total);
您可以使用Sum
monoid遍历该列表
import propOr from 'crocks/helpers/propOr'
import curry from 'crocks/helpers/curry'
import mreduceMap from 'crocks/helpers/mreduceMap'
import Sum from 'crocks/Sum'
var res = [{
data1:{subData1:56, subData2:0, subData3:45},
data2:{subData2:565, subData3:67, subData4:45},
data3:{subData1:45, subData3:0},
data4:{subData1:32, subData2:0, subData3:47},
data5:{subData1:107, subData2:34, subData3:65},
data6:{subData3:123, subData4:43},
data7:{subData1:432, subData2:67, subData3:78},
data8:{subData4:23, subData5:432, subData6:654},
}];
const data = Object.values(res[0])
const getSubData = i => propOr(0, 'subData' + i)
const getDataSum = curry(i => mreduceMap(Sum, getSubData(i)))
console.log(getDataSum(1, data))
// 672 - the sum of all subData1 properties in the list
您可以在纯JS中尝试。 希望能帮助到你。
const res = [{ data1:{subData1:56, subData2:0, subData3:45}, data2:{subData2:565, subData3:67, subData4:45}, data3:{subData1:45, subData3:0}, data4:{subData1:32, subData2:0, subData3:47}, data5:{subData1:107, subData2:34, subData3:65}, data6:{subData3:123, subData4:43}, data7:{subData1:432, subData2:67, subData3:78}, data8:{subData4:23, subData5:432, subData6:654}, }]; const sums = {}; // For each item on your array res.forEach((item) => { Object.keys(item).forEach((key) => { Object.keys(item[key]).forEach((sub) => { // Initialize its position on the sum object if (!sums[sub]) sums[sub] = { sum: 0, name: sub }; sums[sub].sum += item[key][sub]; }); }); }); // Get the total of the subData const total = Object.values(sums).reduce((acc, val) => acc += val.sum, 0.0); console.log('Sums', Object.values(sums)); console.log('Total', total);
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