根据价格和重量范围计算运费，每个额外重量单位应增加运费

Question

我有运输公司，每个公司都有一定的条件来计算运输成本。

运输公司

success: function(response) {
      $('#add-takeout-messages').html('<div class="alert alert-success">' +
      '<button type="button" class="close" data-dismiss="alert">&times;</button>' +
      '<strong><i class="glyphicon glyphicon-ok-sign"></i></strong> ' + response.messages +
      '</div>');
}

条件计算器 ：（使用lodash）

[
  {
    "status": {
      "label": "Active",
      "value": true
    },
    "categories": [

    ],
    "_id": "5c3760435b30ef025d60aca7",
    "title": "Company Name,
    "type": "national",
    "conditions": [
      {
        "priceRange": {
          "min": 0.01,
          "max": 30.01
        },
        "weightRange": {
          "min": 0,
          "max": 2
        },
        "deliveryDays": {
          "label": "2 Days",
          "value": 2
        },
        "status": {
          "label": "Active",
          "value": true
        },
        "paymentMethod": [
          "all"
        ],
        "_id": "5cadc06f02cce3054ccaecc5",
        "cost": 5,
        "extraWeightPrice": 1,
        "eachUnit": 1
      },
      {
        "priceRange": {
          "min": 30.02,
          "max": 100.01
        },
        "weightRange": {
          "min": 0,
          "max": 2
        },
        "deliveryDays": {
          "label": "2 Days",
          "value": 2
        },
        "status": {
          "label": "Active",
          "value": true
        },
        "paymentMethod": [
          "all"
        ],
        "_id": "5cadc06f02cce3054ccaecc4",
        "cost": 5,
        "extraWeightPrice": 1,
        "eachUnit": 2
      },
      {
        "priceRange": {
          "min": 101,
          "max": 50000
        },
        "weightRange": {
          "min": 2,
          "max": 50
        },
        "deliveryDays": {
          "label": "2 Days",
          "value": 2
        },
        "status": {
          "label": "Active",
          "value": true
        },
        "paymentMethod": [
          "all"
        ],
        "_id": "5cadc06f02cce3054ccaecc3",
        "cost": 0
      }
    ],
    "__v": 0,
    "payOnDelivery": 3.5
  }
]

上面的方法工作正常，并且可以返回 const cost = 10; const weight= 1; const availableShippingConditions = shippings.map(shipping => shipping.conditions.filter(condition => { return ( _.inRange( cost, condition.priceRange.min, condition.priceRange.max ) && _.inRange( weight, condition.weightRange.min, condition.weightRange.max ) ); })[0] ); ，但我还需要计算一件事：

能够检查费用是否在condition[0]之间，但priceRange不在范围之内。我需要将weightRange eachUnit添加到最终结果中。

所以

• 如果extraWeightPrice是cost，而10€是weight，我们需要落入5kg，但我们需要添加condition[0]的额外重量成本，因为3€变成eachUnit（3是weightRange.max，重量是2），而5是1因此总运费应为extraWeightPrice（8€，因此cost:5 + 5）。

期望的结果是仅在满足要求的条件下从3数组返回shipping对象，例如：

shippings

编辑： 我成功了，我想知道是否有更优雅的方法来实现这一目标。 （它将返回条件而不是公司）

{
    "title": "Company Name",
    "type": "national",
    "conditions": [
      {
        "priceRange": {
          "min": 0.01,
          "max": 30.01
        },
        "weightRange": {
          "min": 0,
          "max": 2
        },
        "deliveryDays": {
          "label": "2 Days",
          "value": 2
        },
        "status": {
          "label": "Active",
          "value": true
        },
        "paymentMethod": [
          "all"
        ],
        "_id": "5cadc06f02cce3054ccaecc5",
        "cost": 5,  // THIS SHOULD BE 8
        "extraWeightPrice": 1,
        "eachUnit": 1
      }
]
}