#// usage: jjs -scripting weather.js

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// Simple nashorn example showing back-quote exec process,
// JSON and Java8 streams

var Arrays = Java.type("java.util.Arrays");

// use curl to download JSON weather data from the net
// use backquote -scripting mode syntax to exec a process

`curl http://api.openweathermap.org/data/2.5/forecast/daily?q=Chennai&mode=json&units=metric&cnt=7`;

// parse JSON
var weather = JSON.parse($OUT);

// pull out humidity as array
var humidity = weather.list.map(function(curVal) {
    return curVal.humidity;
})

// Stream API to print stat
print("Humidity");
print(Arrays["stream(int[])"](humidity).summaryStatistics());

// pull maximum day time temperature
var temp = weather.list.map(function(curVal) {
    return curVal.temp.max;
});

// Stream API to print stat
print("Max Temperature");
print(Arrays["stream(double[])"](temp).summaryStatistics());