8178380: Module system implementation refresh (5/2017)
Reviewed-by: alanb
Contributed-by: mandy.chung@oracle.com
/* * Copyright (c) 2015, 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. */// Simple sample demonstrating "fixed point" computation with Streams// See also https://mitpress.mit.edu/sicp/chapter1/node21.html#secprocgeneralmethodsvar Stream = Java.type("java.util.stream.Stream");// generic fixed point procedurefunction fixed_point(f, init_guess) { var tolerance = 0.00001; function close_enough(v1, v2) Math.abs(v1 - v2) < tolerance; var prev; return Stream.iterate(init_guess, f) .filter(function(x) { try { return prev == undefined? false : close_enough(prev, x); } finally { prev = x; } }) .findFirst() .get();}// solution to x = cos(x)print(fixed_point(Math.cos, 1.0))// solution to x = sin(x) + cos(x)print(fixed_point(function(x) Math.sin(x) + Math.cos(x), 1.0));// square root by Newton's method// http://en.wikipedia.org/wiki/Newton's_methodfunction sqrt(n) fixed_point(function(x) (x + n/x) / 2, 2.0);print(sqrt(2))print(sqrt(3))