samples/mothers_day.js

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1 # compute Mothers day of the given the year
2
3 /*
4 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * - Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * - Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * - Neither the name of Oracle nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
22 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
28 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 // print "Mother's day" of the given year using Java Time API
35
36 if (arguments.length == 0) {
37 print("Usage: jjs mothers_day.js -- year");
38 exit(1);
39 }
40
41 // java classes used
42 var DayOfWeek = java.time.DayOfWeek;
43 var LocalDate = java.time.LocalDate;
44 var TemporalAdjusters = java.time.temporal.TemporalAdjusters;
45
46 var year = parseInt(arguments[0]);
47
48 // See: https://en.wikipedia.org/?title=Mother%27s_Day
49 // We need second Sunday of May. Make April 30 of the given
50 // year adjust and adjust to next Sunday from there twice. To adjust a Date
51 // we use a common TemporalAdjuster provided in JDK8.
52 // https://docs.oracle.com/javase/8/docs/api/java/time/temporal/TemporalAdjusters.html
53
54 print(LocalDate.of(year, 4, 30).
55 with(TemporalAdjusters.next(DayOfWeek.SUNDAY)).
56 with(TemporalAdjusters.next(DayOfWeek.SUNDAY)));

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