#// Usage: jjs -scripting -cp . jsobject_mapreduce.js

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// Many Array.prototype functions such as map, 

// filter, reduce, reduceRight, every, some are generic.

// These functions accept ECMAScript array as well as 

// many array-like objects including JSObjects.

// See also http://en.wikipedia.org/wiki/MapReduce

`javac BufferArray.java`;

var BufferArray = Java.type("BufferArray");

var buf = new BufferArray(10);

var map = Array.prototype.map;

var filter = Array.prototype.filter;

var reduce = Array.prototype.reduce;

// make random list of numbers

for (var i = 0; i < 10; i++)

    buf[i] = Math.random();

var forEach = Array.prototype.forEach;

// print numbers in the list

forEach.call(buf, function(x) print(x));

// print sum of squares of the random numbers

print("Square sum:",

    reduce.call(

        map.call(buf, function(x) x*x), 

        function(x, y) x + y)

);