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8042600: Add more samples in nashorn/samples directory

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Reviewed-by: jlaskey, hannesw
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Athijegannathan Sundararajan 2014-05-07 20:20:58 +05:30
parent b705fef9d6
commit f7e89ae474
54 changed files with 3364 additions and 51 deletions
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nashorn/samples/array_mapreduce.js Normal file
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/*
* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// Usage: jjs array_mapreduce.js
// 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 java arrays.
// So, you can do map/filter/reduce with Java streams or
// you can also use Array.prototype functions as below.
// See also http://en.wikipedia.org/wiki/MapReduce
var DoubleArray = Java.type("double[]");
var StringArray = Java.type("java.lang.String[]");
var map = Array.prototype.map;
var filter = Array.prototype.filter;
var reduce = Array.prototype.reduce;
var jarr = new StringArray(5);
jarr[0] = "nashorn";
jarr[1] = "ecmascript";
jarr[2] = "javascript";
jarr[3] = "js";
jarr[4] = "scheme";
// sum of word lengths
print("Sum word length:",
reduce.call(
map.call(jarr, function(x) x.length),
function(x, y) x + y)
);
// another array example involving numbers
jarr = new DoubleArray(10);
// make random array of numbers
for (var i = 0; i < jarr.length; i++)
jarr[i] = Math.random();
var forEach = Array.prototype.forEach;
// print numbers in the array
forEach.call(jarr, function(x) print(x));
// print sum of squares of the random numbers
print("Square sum:",
reduce.call(
map.call(jarr, function(x) x*x),
function(x, y) x + y)
);