为什么函数内部的运算符'+'不会修改* def制成的变量? [英] Why operator '+' inside functions does not modify * def made variables?

问题描述

我正在尝试处理从API获得的json-s列表.

I'm trying to process a list of json-s that I got as an answer from an API.

[
  {
    "originalEstimate": "16h",
    "remainingEstimate": "9h",
    "timeSpent": "7h"
  },
  {
    "originalEstimate": "64h",
    "remainingEstimate": "63h",
    "timeSpent": "1h"
  }
]

我必须对字段求和，并且为它想出了一个代码，但是看来它并没有修改mySum变量.

I have to sum the fields and I came up with a code for it, but it seems like it does not modify the mySum variable.

在此示例中，我仅使用了'originalEstimate'.

For this example, I just used the 'originalEstimate'.

我尝试手动添加元素，并且可以正常工作.例如:(parseFloat(getNum(json [0] .originalEstimate)))== 16.0

I tried to add manually the elements and that works. Ex.: (parseFloat(getNum(json[0].originalEstimate))) == 16.0

getNum是一个从字符串中削减'h'的函数.

getNum is a function that cuts the 'h' down from the string.

代码如下:

    * def getNum = function (a)  {return a.substring(0,a.length()-1)}
* text raw =
    """
  [
    {
      "originalEstimate": "16h",
      "remainingEstimate": "9h",
      "timeSpent": "7h"
    },
    {
      "originalEstimate": "64h",
      "remainingEstimate": "63h",
      "timeSpent": "1h"
    }
  ]
  """
    * json json = raw
    * def mySum = 0
    * def fn = function(x) {mySum = mySum + (parseFloat(getNum(x.originalEstimate)))}
    * eval karate.forEach(json,fn)
    * print mySum

我希望看到80.0是原始的估算总和，但我收到了0.而且，它运行得很好，只是不修改mySum

I expected to see 80.0 as originalEstimate sum but I received 0. Also, it runs perfectly, just does not modify the mySum

推荐答案

是的，当您声明一个函数时，变量被锁定到声明该函数时的值.解决方法是使用karate.get()和karate.set():

Yes, when you declare a function, variables are locked to the value at the time the function was declared. The solution is use karate.get() and karate.set():

* def getNum = function(x){ return x.substring(0, x.length() - 1) }
* def sum = 0
* def fun = function(x){ var temp = karate.get('sum') + parseFloat(getNum(x.originalEstimate)); karate.set('sum', temp) }
* def response =
"""
[
  {
    "originalEstimate": "16h",
    "remainingEstimate": "9h",
    "timeSpent": "7h"
  },
  {
    "originalEstimate": "64h",
    "remainingEstimate": "63h",
    "timeSpent": "1h"
  }
]
"""
* eval karate.forEach(response, fun)
* print sum

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