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| const data = [ | |
| { | |
| transactionId: "t-100", | |
| userId: 123, | |
| category: "appliances", | |
| total: 22.4, | |
| }, | |
| { | |
| transactionId: "t-101", | |
| userId: 123, | |
| category: "electronics", | |
| total: 120.8, | |
| }, | |
| { | |
| transactionId: "t-102", | |
| userId: 122, | |
| category: "appliances", | |
| total: 280.4, | |
| }, | |
| { | |
| transactionId: "t-103", | |
| userId: 122, | |
| category: "electronics", | |
| total: 0.4, | |
| }, | |
| { | |
| transactionId: "t-104", | |
| userId: 121, | |
| category: "appliances", | |
| total: 1800, | |
| }, | |
| { | |
| transactionId: "t-105", | |
| userId: 124, | |
| category: "electronics", | |
| total: 1222, | |
| }, | |
| ]; | |
| class transactionsUtils { | |
| static highestTransactionId = (arr) => { | |
| const reducer = (highestObj, currentObj) => highestObj = currentObj.total > highestObj.total ? currentObj : highestObj; | |
| return arr.reduce(reducer, arr[0]).transactionId; | |
| } | |
| static _highestSumOfUnit = (arr, property) => { //helper function | |
| const sums = {}; | |
| arr.forEach(transaction => { | |
| sums[transaction[property]] = sums[transaction[property]] == undefined ? transaction.total : sums[transaction[property]] + transaction.total; | |
| }); | |
| return Object.keys(sums).reduce((highestSum, current) => highestSum = sums[current] > sums[highestSum] ? current : highestSum, Object.keys(sums)[0]) | |
| } | |
| static highestSumOfTransactionsUser = (arr) => this._highestSumOfUnit(arr, 'userId') | |
| static highestSalesCategory = (arr) => this._highestSumOfUnit(arr, 'category') | |
| } | |
| console.log(transactionsUtils.highestTransactionId(data)) | |
| console.log(transactionsUtils.highestSumOfTransactionsUser(data)) | |
| console.log(transactionsUtils.highestSalesCategory(data)) |
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