es6在map循环中调用函数

时间：2019-05-02 16:25:19

标签： javascript ecmascript-6

以下代码可以正常工作。

var FundClasses = {"FundDetailsViewModel":[{"CogencyClasses":[{"Id":1121,"FundId":652,"ShareClass":"Class B","LocalCurrency":"USD","Name":"Class B USD"}],"FundClassDetailsViewModel":[{"Id":305583,"Description":null,"InvestedAmount":900000,"InceptionDate":null,"LegalFundClassId":13713,"LegalFundClassName":"Class A","DataReference":null,"CogencyClassId":null,"CogencyClassName":null,"ClosureStatusId":103,"ClosureStatusName":"In Liquidation","IsSidePocket":true,"IsThematic":true,"VehicleTypeId":1,"VehicleTypeName":"FX Trade","FundId":237146,"FundName":"P Sylebra Ltd."},{"Id":250028,"Description":"Class A","InvestedAmount":23732600,"InceptionDate":null,"LegalFundClassId":13713,"LegalFundClassName":"Class A","DataReference":null,"CogencyClassId":1121,"CogencyClassName":null,"ClosureStatusId":null,"ClosureStatusName":null,"IsSidePocket":false,"IsThematic":false,"VehicleTypeId":null,"VehicleTypeName":null,"FundId":237146,"FundName":"P Sylebra Ltd."},{"Id":250029,"Description":"Class B","InvestedAmount":119307314,"InceptionDate":null,"LegalFundClassId":13717,"LegalFundClassName":"Class B","DataReference":null,"CogencyClassId":null,"CogencyClassName":null,"ClosureStatusId":null,"ClosureStatusName":null,"IsSidePocket":false,"IsThematic":false,"VehicleTypeId":null,"VehicleTypeName":null,"FundId":237146,"FundName":"P Sylebra Ltd."},{"Id":250030,"Description":"Class B1","InvestedAmount":null,"InceptionDate":"2014-05-01T00:00:00","LegalFundClassId":13716,"LegalFundClassName":"Class B1","DataReference":null,"CogencyClassId":null,"CogencyClassName":null,"ClosureStatusId":null,"ClosureStatusName":null,"IsSidePocket":false,"IsThematic":false,"VehicleTypeId":null,"VehicleTypeName":null,"FundId":237146,"FundName":"P Sylebra Ltd."},{"Id":250031,"Description":"Class C","InvestedAmount":null,"InceptionDate":"2014-07-31T00:00:00","LegalFundClassId":13715,"LegalFundClassName":"Class C","DataReference":null,"CogencyClassId":null,"CogencyClassName":null,"ClosureStatusId":null,"ClosureStatusName":null,"IsSidePocket":false,"IsThematic":false,"VehicleTypeId":null,"VehicleTypeName":null,"FundId":237146,"FundName":"P Sylebra Ltd."},{"Id":250032,"Description":"Class D","InvestedAmount":null,"InceptionDate":"2014-07-31T00:00:00","LegalFundClassId":13714,"LegalFundClassName":"Class D","DataReference":null,"CogencyClassId":null,"CogencyClassName":null,"ClosureStatusId":null,"ClosureStatusName":null,"IsSidePocket":false,"IsThematic":false,"VehicleTypeId":null,"VehicleTypeName":null,"FundId":237146,"FundName":"P Sylebra Ltd."},{"Id":305581,"Description":"T","InvestedAmount":null,"InceptionDate":null,"LegalFundClassId":13713,"LegalFundClassName":"Class A","DataReference":null,"CogencyClassId":null,"CogencyClassName":null,"ClosureStatusId":null,"ClosureStatusName":null,"IsSidePocket":false,"IsThematic":false,"VehicleTypeId":null,"VehicleTypeName":null,"FundId":237146,"FundName":"P Sylebra Ltd."}],"PrimaryLegalFundClasses":[{"Id":237146,"Description":"Class A","ClassType":3},{"Id":237146,"Description":"Class B","ClassType":3},{"Id":237146,"Description":"Class B1","ClassType":3},{"Id":237146,"Description":"Class C","ClassType":3},{"Id":237146,"Description":"Class D","ClassType":3}]},{"CogencyClasses":[{"Id":0,"FundId":0,"ShareClass":"Assign Cogency Fund First","LocalCurrency":null,"Name":"Assign Cogency Fund First "}],"FundClassDetailsViewModel":[{"Id":100541,"Description":"Class A","InvestedAmount":null,"InceptionDate":null,"LegalFundClassId":11167,"LegalFundClassName":"Class A","DataReference":null,"CogencyClassId":null,"CogencyClassName":null,"ClosureStatusId":null,"ClosureStatusName":null,"IsSidePocket":false,"IsThematic":false,"VehicleTypeId":null,"VehicleTypeName":null,"FundId":5508,"FundName":"Sylebra Capital Partners (Offshore) Ltd"},{"Id":250033,"Description":"Class B","InvestedAmount":null,"InceptionDate":null,"LegalFundClassId":11166,"LegalFundClassName":"Class B","DataReference":null,"CogencyClassId":null,"CogencyClassName":null,"ClosureStatusId":null,"ClosureStatusName":null,"IsSidePocket":false,"IsThematic":false,"VehicleTypeId":null,"VehicleTypeName":null,"FundId":5508,"FundName":"Sylebra Capital Partners (Offshore) Ltd"}],"PrimaryLegalFundClasses":[{"Id":5508,"Description":"Class A","ClassType":1},{"Id":5508,"Description":"Class B","ClassType":1}]}],"VehicleTypes":[{"Id":108,"Spf":false,"Name":"Secondaries","SortOrder":null,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":100,"Spf":false,"Name":"Co-Investment (non-SPF)","SortOrder":1,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":true,"IsCardiff":true},{"Id":1,"Spf":false,"Name":"FX Trade","SortOrder":2,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":3,"Spf":false,"Name":"Listed ETF","SortOrder":3,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":4,"Spf":false,"Name":"Listed Security","SortOrder":4,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":2,"Spf":false,"Name":"Mutual Fund","SortOrder":5,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":5,"Spf":false,"Name":"Offshore Fund","SortOrder":6,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":6,"Spf":false,"Name":"Onshore US - 40 Act Fund","SortOrder":7,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":9,"Spf":false,"Name":"Onshore US Non - 40 Act Fund","SortOrder":8,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":8,"Spf":false,"Name":"EnTrustPermal Product","SortOrder":9,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":7,"Spf":true,"Name":"EnTrustPermal SPF - Standard","SortOrder":10,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":true,"IsCardiff":false},{"Id":105,"Spf":true,"Name":"EnTrustPermal SPF – 40 Act","SortOrder":10,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":106,"Spf":true,"Name":"EnTrustPermal SPF – UCITS","SortOrder":10,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":102,"Spf":true,"Name":"EnTrustPermal SPF - Blocker","SortOrder":10,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":103,"Spf":true,"Name":"EnTrustPermal SPF - Co-Investment","SortOrder":10,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":true,"IsCardiff":true},{"Id":104,"Spf":true,"Name":"EnTrustPermal SPF - Special Sit","SortOrder":10,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":true,"IsCardiff":true},{"Id":10,"Spf":false,"Name":"Private Equity","SortOrder":11,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":true,"IsCardiff":false},{"Id":101,"Spf":false,"Name":"Side-Pocket","SortOrder":12,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":true,"IsCardiff":false},{"Id":11,"Spf":false,"Name":"Special Situation (non-SPF)","SortOrder":13,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":true,"IsCardiff":true},{"Id":12,"Spf":false,"Name":"Third Party Fund of Funds","SortOrder":14,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":13,"Spf":false,"Name":"UCITS","SortOrder":15,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false},{"Id":14,"Spf":false,"Name":"Other","SortOrder":50,"AumReadOnly":false,"PerformanceReadOnly":false,"BloombergTickerRequired":false,"ClassLevel":false,"IsCardiff":false}],"ClosureStatuses":[{"Id":110,"Name":"Hard Closed","IsActive":true,"SortOrder":null},{"Id":111,"Name":"Open","IsActive":true,"SortOrder":null},{"Id":112,"Name":"Soft Closed","IsActive":true,"SortOrder":null},{"Id":1,"Name":"Open - to all","IsActive":true,"SortOrder":1},{"Id":2,"Name":"Open - to Permal only","IsActive":true,"SortOrder":2},{"Id":3,"Name":"Closed - hard","IsActive":true,"SortOrder":3},{"Id":104,"Name":"Closed - with wait list","IsActive":true,"SortOrder":4},{"Id":100,"Name":"Closed - but will reopen","IsActive":true,"SortOrder":5},{"Id":21,"Name":"Closed - but replacing redemptions","IsActive":true,"SortOrder":6},{"Id":101,"Name":"Redemptions Gated","IsActive":true,"SortOrder":7},{"Id":102,"Name":"Redemptions Suspended","IsActive":true,"SortOrder":8},{"Id":103,"Name":"In Liquidation","IsActive":true,"SortOrder":9}]}
var models = FundClasses.FundDetailsViewModel.reduce((prev, next) => prev.concat(next.FundClassDetailsViewModel), []);

//this.FundClass = models.find(obj => obj.Id === 305583);
console.log(models.find(obj => obj.Id === 305583));

我的问题是如何避免多次调用getOrderLine（）？

2 个答案:

答案 0 :(得分：2)

使用函数体代替函数表达式：

.map(prod => {
   const o = getOrderLine(params, prod);
   return {
     purchaseOrderLine: null,
     haulerCostCode: o.haulCostCode,
     productCostCode: o.productCostCode,
     typeOfWork: o.productCostCode,
   }
 })

答案 1 :(得分：1)

您可以使用函数组合-

const comp = (f, g) =>
  x => f(g(x))

const getOrderLine = params => ticketLine =>
  params.orderDetail.order.orderLineItems
    .find(orderLine => orderLine.id == ticketLine.id)

const makeProduct = orderLine =>
  ( { purchaseOrderLine: null
    , haulerCostCode: orderLine.haulCostCode
    , productCostCode: orderLine.productCostCode
    , typeOfWork: orderLine.productCostCode
    }
  )

const getProducts = params =>
    params.productQuantities
      .map(comp(makeProduct, getOrderLine(params)))

我删除了reduce位，因为这没有任何意义。 map已经创建了一个新数组。

这里还有其他严重的问题。这些功能正在挖掘对象属性，有时深度达三个级别。这在您的代码库中创建了紧密的耦合。参见Law of Demeter

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