Getting the maximum value from an array in a JSON response in Karate

Question

I have the following Json as a response from a API call

{
  \"location\": {
    \"name\": \"London\",
    \"region\": \"City of London, Greater London\",
    \"c         


        

Answer 1

Best practice in Karate is to NOT use JS for loops at all. It results in cleaner, more readable code:

* def fun = function(x){ return { max: x.day.maxtemp_c, date: x.date } }
* def list = karate.map(response.forecast.forecastday, fun)
* def max = 0
* def index = 0
* def finder =
"""
function(x, i) {
  var max = karate.get('max');
  if (x.max > max) {
    karate.set('max', x.max);
    karate.set('index', i);
  }  
}
"""
* karate.forEach(list, finder)
* print 'found at index', index
* print 'item:', list[index]

Note how easy it is to re-shape a given JSON, the result of list here would be:

[
  {
    "max": 9,
    "date": "2020-03-03"
  },
  {
    "max": 8,
    "date": "2020-03-04"
  },
  {
    "max": 7,
    "date": "2020-03-05"
  }
]