function - Javascript functional logic not working -


i trying create object

currency

opening balance

and closing balance

i have following data

var _ = require('underscore');  var accounts=[     {       "id":"20",       "name":"oasis mall-rmb account",       "branchid":"6",       "type_id":"1",       "currency_id":"1",       "balance":"0",       "createdby":"2",       "active":"1",       "ts":"2017-06-30 00:12:08"     },     {       "id":"21",       "name":"oasis mall-usd account",       "branchid":"6",       "type_id":"1",       "currency_id":"2",       "balance":"0",       "createdby":"2",       "active":"1",       "ts":"2017-06-30 00:12:09"     },     {       "id":"22","name":"oasis mall-dirham account",       "branchid":"6",       "type_id":"1",       "currency_id":"3",       "balance":"0",       "createdby":"2",       "active":"1",       "ts":"2017-06-30 00:12:09"     },     {       "id":"23",       "name":"oasis mall-ugx account",       "branchid":"6",       "type_id":"1",       "currency_id":"4",       "balance":"0",       "createdby":"2",       "active":"1",       "ts":"2017-06-30 00:12:09"     },     {       "id":"24",       "name":"oasis mall-ksh account",       "branchid":"6",       "type_id":"1",       "currency_id":"5",       "balance":"0",       "createdby":"2",       "active":"1",       "ts":"2017-06-30 00:12:09"     } ]  var balances =[   {     "id":"101",     "branchid":"6",     "accountid":"20",     "openingbalance":"3260000",     "closingbalance":"3260000",     "date":"2017-08-15",     "ts":"2017-08-15 02:27:08"   },   {     "id":"102",     "branchid":"6",     "accountid":"21",     "openingbalance":"1882492",     "closingbalance":"1882492",     "date":"2017-08-15",     "ts":"2017-08-15 02:27:08"   },   {     "id":"103","branchid":"6",     "accountid":"22",     "openingbalance":"-3000",     "closingbalance":"-3000",     "date":"2017-08-15",     "ts":"2017-08-15 02:27:08"   },   {     "id":"104",     "branchid":"6",     "accountid":"23",     "openingbalance":"95199318",     "closingbalance":"95199318",     "date":"2017-08-15",     "ts":"2017-08-15 02:27:08"   },   {     "id":"105",     "branchid":"6",     "accountid":"24",     "openingbalance":"1847000",     "closingbalance":"1847000",     "date":"2017-08-15",     "ts":"2017-08-15 02:27:08"   } ]

i know how in loops , if statements. want functional way have tried writing code.

var displayaccounts = function(accounts,balances){    var displayaccounts = _(accounts).map((x)=>{         var mybalance = _(balances)       .reduce((acc,z)=>{          acc={            currency :x.currency_id,            openingbalance : z.openingbalance,            closingbalance : z.closingbalance          };          return acc;       },{});      return mybalance;    });   return  displayaccounts; }  console.log(displayaccounts(accounts,balances));

but gives me answer dont like. gives me

[ { currency: '1',     openingbalance: '1847000',     closingbalance: '1847000' },   { currency: '2',     openingbalance: '1847000',     closingbalance: '1847000' },   { currency: '3',     openingbalance: '1847000',     closingbalance: '1847000' },   { currency: '4',     openingbalance: '1847000',     closingbalance: '1847000' },   { currency: '5',     openingbalance: '1847000',     closingbalance: '1847000' } ]

the same opening , closing balances throught. need each currency corresponding opening , closing balances .

[ { currency: '1',     openingbalance: '3260000',     closingbalance: '3260000' },   { currency: '2',     openingbalance: '1882492',     closingbalance: '1882492' },   { currency: '3',     openingbalance: '-3000',     closingbalance: '-3000' },   { currency: '4',     openingbalance: '95199318',     closingbalance: '95199318' },   { currency: '5',     openingbalance: '1847000',     closingbalance: '1847000' } ]

how can ?

this not pure functional approach generates desired result:

function displayaccounts(acc, bal) {     return acc.map(x => {         let b = bal.find(b => b.accountid === x.id);         return {             currency: x.currency_id,             openingbalance: b.openingbalance,             closingbalance: b.closingbalance         }     }); }  console.log(displayaccounts(accounts, balances));

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