我有以下Json作为API调用的响应
{
"location": {
"name": "London",
"region": "City of London, Greater London",
"country": "United Kingdom",
"lat": 51.52,
"lon": -0.11,
"tz_id": "Europe/London",
"localtime_epoch": 1583594426,
"localtime": "2020-03-07 15:20"
},
"forecast": {
"forecastday": [
{
"date": "2020-03-03",
"day": {
"maxtemp_c": 9,
"mintemp_c": 4
}
},
{
"date": "2020-03-04",
"day": {
"maxtemp_c": 8,
"mintemp_c": 4.1
}
},
{
"date": "2020-03-05",
"day": {
"maxtemp_c": 7,
"mintemp_c": 5.6
}
}
]
}
}
我想找出三天当中哪个日期温度最高。
我正在检查js函数中的温度元素时，当前执行的方式效率很低，如下所示
* def hottest =
"""
function(array) {
var greatest;
var indexOfGreatest;
for (var i = 0; i < array.length; i++) {
if (!greatest || array[i].day.maxtemp_c > greatest) {
greatest = array[i].day.maxtemp_c;
indexOfGreatest = i;
}
}
return indexOfGreatest;
}
"""
* def index = call hottest response.forecast.forecastday
* def hottestdate = response.forecast.forecastday[index].date
* print hottestdate
这样我会得到正确的结果，但是有人可以建议一种更好的方法吗？
空手道的最佳做法是完全不使用JS进行循环。这样可以生成更清晰，更易读的代码：
* 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]
请注意，重塑给定的JSON很容易，list这里的结果将是：
[
{
"max": 9,
"date": "2020-03-03"
},
{
"max": 8,
"date": "2020-03-04"
},
{
"max": 7,
"date": "2020-03-05"
}
]
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