How to resolve the algorithm Day of the week step by step in the Ruby programming language
How to resolve the algorithm Day of the week step by step in the Ruby programming language
Table of Contents
Problem Statement
A company decides that whenever Xmas falls on a Sunday they will give their workers all extra paid holidays so that, together with any public holidays, workers will not have to work the following week (between the 25th of December and the first of January).
In what years between 2008 and 2121 will the 25th of December be a Sunday? Using any standard date handling libraries of your programming language; compare the dates calculated with the output of other languages to discover any anomalies in the handling of dates which may be due to, for example, overflow in types used to represent dates/times similar to y2k type problems.
Let's start with the solution:
Step by Step solution about How to resolve the algorithm Day of the week step by step in the Ruby programming language
This Ruby code iterates over a range of years and checks if the 25th of December in each year falls on a Sunday using two different syntaxes:
- Using Date: The code block iterates from year 2008 to 2121 and for each year:
- It creates a Date object for December 25th of that year using
Date.new(year, 12, 25)
. - It checks if the Date object is a Sunday using the
sunday?
method. - If it's a Sunday, it prints the year in "25 Dec yyyy" format.
- Using Time: This code block also iterates from the same range of years, but it uses the Time class to check for the day of the week:
- For each year, it creates a Time object for December 25th using
Time.local(year, 12, 25)
. - It checks if the Time object is a Sunday using the
sunday?
method. - If it's a Sunday, it prints the year in "25 Dec yyyy" format.
Both of these methods achieve the same result. The Time class can be more precise in representing time as it handles timezones, while the Date class is more geared towards working with just dates.
Source code in the ruby programming language
require 'date'
(2008..2121).each {|year| puts "25 Dec #{year}" if Date.new(year, 12, 25).sunday? }
(2008..2121).each {|year| puts "25 Dec #{year}" if Time.local(year, 12, 25).sunday?}
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