Syncing Up
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36
go/meetup/README.md
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36
go/meetup/README.md
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# Meetup
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Calculate the date of meetups.
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Typically meetups happen on the same day of the week.
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Examples are
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- the first Monday
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- the third Tuesday
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- the Wednesteenth
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- the last Thursday
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Note that "Monteenth", "Tuesteenth", etc are all made up words. There
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was a meetup whose members realised that there are exactly 7 days that
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end in '-teenth'. Therefore, one is guaranteed that each day of the week
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(Monday, Tuesday, ...) will have exactly one date that is named with '-teenth'
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in every month.
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To run the tests simply run the command `go test` in the exercise directory.
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If the test suite contains benchmarks, you can run these with the `-bench`
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flag:
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go test -bench .
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For more detailed info about the Go track see the [help
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page](http://exercism.io/languages/go).
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## Source
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Jeremy Hinegardner mentioned a Boulder meetup that happens on the Wednesteenth of every month [https://twitter.com/copiousfreetime](https://twitter.com/copiousfreetime)
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## Submitting Incomplete Problems
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It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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110
go/meetup/cases_test.go
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110
go/meetup/cases_test.go
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package meetup
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// Source: exercism/x-common
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// Commit: b237b7b Merge pull request #124 from soniakeys/meetup-common-tests
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import "time"
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var testCases = []struct {
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year int
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month time.Month
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week WeekSchedule
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weekday time.Weekday
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expDay int
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}{
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{2013, 5, Teenth, time.Monday, 13}, // monteenth of May 2013
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{2013, 8, Teenth, time.Monday, 19}, // monteenth of August 2013
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{2013, 9, Teenth, time.Monday, 16}, // monteenth of September 2013
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{2013, 3, Teenth, time.Tuesday, 19}, // tuesteenth of March 2013
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{2013, 4, Teenth, time.Tuesday, 16}, // tuesteenth of April 2013
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{2013, 8, Teenth, time.Tuesday, 13}, // tuesteenth of August 2013
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{2013, 1, Teenth, time.Wednesday, 16}, // wednesteenth of January 2013
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{2013, 2, Teenth, time.Wednesday, 13}, // wednesteenth of February 2013
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{2013, 6, Teenth, time.Wednesday, 19}, // wednesteenth of June 2013
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{2013, 5, Teenth, time.Thursday, 16}, // thursteenth of May 2013
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{2013, 6, Teenth, time.Thursday, 13}, // thursteenth of June 2013
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{2013, 9, Teenth, time.Thursday, 19}, // thursteenth of September 2013
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{2013, 4, Teenth, time.Friday, 19}, // friteenth of April 2013
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{2013, 8, Teenth, time.Friday, 16}, // friteenth of August 2013
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{2013, 9, Teenth, time.Friday, 13}, // friteenth of September 2013
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{2013, 2, Teenth, time.Saturday, 16}, // saturteenth of February 2013
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{2013, 4, Teenth, time.Saturday, 13}, // saturteenth of April 2013
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{2013, 10, Teenth, time.Saturday, 19}, // saturteenth of October 2013
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{2013, 5, Teenth, time.Sunday, 19}, // sunteenth of May 2013
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{2013, 6, Teenth, time.Sunday, 16}, // sunteenth of June 2013
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{2013, 10, Teenth, time.Sunday, 13}, // sunteenth of October 2013
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{2013, 3, First, time.Monday, 4}, // first Monday of March 2013
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{2013, 4, First, time.Monday, 1}, // first Monday of April 2013
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{2013, 5, First, time.Tuesday, 7}, // first Tuesday of May 2013
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{2013, 6, First, time.Tuesday, 4}, // first Tuesday of June 2013
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{2013, 7, First, time.Wednesday, 3}, // first Wednesday of July 2013
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{2013, 8, First, time.Wednesday, 7}, // first Wednesday of August 2013
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{2013, 9, First, time.Thursday, 5}, // first Thursday of September 2013
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{2013, 10, First, time.Thursday, 3}, // first Thursday of October 2013
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{2013, 11, First, time.Friday, 1}, // first Friday of November 2013
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{2013, 12, First, time.Friday, 6}, // first Friday of December 2013
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{2013, 1, First, time.Saturday, 5}, // first Saturday of January 2013
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{2013, 2, First, time.Saturday, 2}, // first Saturday of February 2013
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{2013, 3, First, time.Sunday, 3}, // first Sunday of March 2013
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{2013, 4, First, time.Sunday, 7}, // first Sunday of April 2013
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{2013, 3, Second, time.Monday, 11}, // second Monday of March 2013
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{2013, 4, Second, time.Monday, 8}, // second Monday of April 2013
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{2013, 5, Second, time.Tuesday, 14}, // second Tuesday of May 2013
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{2013, 6, Second, time.Tuesday, 11}, // second Tuesday of June 2013
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{2013, 7, Second, time.Wednesday, 10}, // second Wednesday of July 2013
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{2013, 8, Second, time.Wednesday, 14}, // second Wednesday of August 2013
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{2013, 9, Second, time.Thursday, 12}, // second Thursday of September 2013
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{2013, 10, Second, time.Thursday, 10}, // second Thursday of October 2013
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{2013, 11, Second, time.Friday, 8}, // second Friday of November 2013
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{2013, 12, Second, time.Friday, 13}, // second Friday of December 2013
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{2013, 1, Second, time.Saturday, 12}, // second Saturday of January 2013
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{2013, 2, Second, time.Saturday, 9}, // second Saturday of February 2013
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{2013, 3, Second, time.Sunday, 10}, // second Sunday of March 2013
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{2013, 4, Second, time.Sunday, 14}, // second Sunday of April 2013
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{2013, 3, Third, time.Monday, 18}, // third Monday of March 2013
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{2013, 4, Third, time.Monday, 15}, // third Monday of April 2013
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{2013, 5, Third, time.Tuesday, 21}, // third Tuesday of May 2013
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{2013, 6, Third, time.Tuesday, 18}, // third Tuesday of June 2013
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{2013, 7, Third, time.Wednesday, 17}, // third Wednesday of July 2013
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{2013, 8, Third, time.Wednesday, 21}, // third Wednesday of August 2013
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{2013, 9, Third, time.Thursday, 19}, // third Thursday of September 2013
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{2013, 10, Third, time.Thursday, 17}, // third Thursday of October 2013
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{2013, 11, Third, time.Friday, 15}, // third Friday of November 2013
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{2013, 12, Third, time.Friday, 20}, // third Friday of December 2013
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{2013, 1, Third, time.Saturday, 19}, // third Saturday of January 2013
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{2013, 2, Third, time.Saturday, 16}, // third Saturday of February 2013
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{2013, 3, Third, time.Sunday, 17}, // third Sunday of March 2013
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{2013, 4, Third, time.Sunday, 21}, // third Sunday of April 2013
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{2013, 3, Fourth, time.Monday, 25}, // fourth Monday of March 2013
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{2013, 4, Fourth, time.Monday, 22}, // fourth Monday of April 2013
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{2013, 5, Fourth, time.Tuesday, 28}, // fourth Tuesday of May 2013
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{2013, 6, Fourth, time.Tuesday, 25}, // fourth Tuesday of June 2013
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{2013, 7, Fourth, time.Wednesday, 24}, // fourth Wednesday of July 2013
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{2013, 8, Fourth, time.Wednesday, 28}, // fourth Wednesday of August 2013
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{2013, 9, Fourth, time.Thursday, 26}, // fourth Thursday of September 2013
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{2013, 10, Fourth, time.Thursday, 24}, // fourth Thursday of October 2013
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{2013, 11, Fourth, time.Friday, 22}, // fourth Friday of November 2013
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{2013, 12, Fourth, time.Friday, 27}, // fourth Friday of December 2013
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{2013, 1, Fourth, time.Saturday, 26}, // fourth Saturday of January 2013
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{2013, 2, Fourth, time.Saturday, 23}, // fourth Saturday of February 2013
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{2013, 3, Fourth, time.Sunday, 24}, // fourth Sunday of March 2013
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{2013, 4, Fourth, time.Sunday, 28}, // fourth Sunday of April 2013
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{2013, 3, Last, time.Monday, 25}, // last Monday of March 2013
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{2013, 4, Last, time.Monday, 29}, // last Monday of April 2013
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{2013, 5, Last, time.Tuesday, 28}, // last Tuesday of May 2013
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{2013, 6, Last, time.Tuesday, 25}, // last Tuesday of June 2013
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{2013, 7, Last, time.Wednesday, 31}, // last Wednesday of July 2013
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{2013, 8, Last, time.Wednesday, 28}, // last Wednesday of August 2013
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{2013, 9, Last, time.Thursday, 26}, // last Thursday of September 2013
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{2013, 10, Last, time.Thursday, 31}, // last Thursday of October 2013
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{2013, 11, Last, time.Friday, 29}, // last Friday of November 2013
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{2013, 12, Last, time.Friday, 27}, // last Friday of December 2013
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{2013, 1, Last, time.Saturday, 26}, // last Saturday of January 2013
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{2013, 2, Last, time.Saturday, 23}, // last Saturday of February 2013
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{2013, 3, Last, time.Sunday, 31}, // last Sunday of March 2013
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{2013, 4, Last, time.Sunday, 28}, // last Sunday of April 2013
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{2012, 2, Last, time.Wednesday, 29}, // last Wednesday of February 2012
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{2014, 12, Last, time.Wednesday, 31}, // last Wednesday of December 2014
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{2015, 2, Last, time.Sunday, 22}, // last Sunday of February 2015
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{2012, 12, First, time.Friday, 7}, // first Friday of December 2012
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}
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76
go/meetup/meetup.go
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76
go/meetup/meetup.go
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package meetup
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import "time"
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const testVersion = 3
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type WeekSchedule int
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const (
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First WeekSchedule = iota
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Second
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Third
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Fourth
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Last
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Teenth
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)
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// Day calculates which day of the month the requested day falls on
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func Day(week WeekSchedule, weekday time.Weekday, month time.Month, year int) int {
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var t time.Time
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switch week {
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case First:
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t = time.Date(year, month, 1, 0, 0, 0, 0, time.UTC)
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if t.Weekday() == weekday {
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return t.Day()
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}
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case Second:
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t = time.Date(year, month, 8, 0, 0, 0, 0, time.UTC)
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if t.Weekday() == weekday {
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return t.Day()
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}
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case Third:
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t = time.Date(year, month, 15, 0, 0, 0, 0, time.UTC)
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if t.Weekday() == weekday {
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return t.Day()
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}
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case Fourth:
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t = time.Date(year, month, 22, 0, 0, 0, 0, time.UTC)
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if t.Weekday() == weekday {
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return t.Day()
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}
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case Last:
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t = time.Date(year, month+1, 1, 0, 0, 0, 0, time.UTC)
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t = t.AddDate(0, 0, -1)
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if t.Weekday() == weekday {
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return t.Day()
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}
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return findPrevDay(weekday, t).Day()
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case Teenth:
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t = time.Date(year, month, 13, 0, 0, 0, 0, time.UTC)
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if t.Weekday() == weekday {
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return t.Day()
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}
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}
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return findNextDay(weekday, t).Day()
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}
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// findNextDay finds the next 'weekday' after t
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func findNextDay(weekday time.Weekday, t time.Time) time.Time {
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t = t.AddDate(0, 0, 1)
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dow := t.Weekday()
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for ; dow != weekday; dow = t.Weekday() {
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t = t.AddDate(0, 0, 1)
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}
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return t
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}
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// findPrevDay finds the previous 'weekday' before t
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func findPrevDay(weekday time.Weekday, t time.Time) time.Time {
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t = t.AddDate(0, 0, -1)
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dow := t.Weekday()
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for ; dow != weekday; dow = t.Weekday() {
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t = t.AddDate(0, 0, -1)
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}
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return t
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}
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39
go/meetup/meetup_test.go
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39
go/meetup/meetup_test.go
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package meetup
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import "testing"
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/* API
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package meetup
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type Weekschedule
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WeekSchedule First
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WeekSchedule Second
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WeekSchedule Third
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WeekSchedule Fourth
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WeekSchedule Last
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WeekSchedule Teenth
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func Day(WeekSchedule, time.Weekday, time.Month, int) int
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*/
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const targetTestVersion = 3
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var weekName = map[WeekSchedule]string{
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First: "first",
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Second: "second",
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Third: "third",
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Fourth: "fourth",
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Teenth: "teenth",
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Last: "last",
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}
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func TestDay(t *testing.T) {
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if testVersion != targetTestVersion {
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t.Fatalf("Found testVersion = %v, want %v", testVersion, targetTestVersion)
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}
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for _, test := range testCases {
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res := Day(test.week, test.weekday, test.month, test.year)
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if res != test.expDay {
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t.Fatalf("For %s %s of %s 2013 got date of %d, want %d",
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weekName[test.week], test.weekday, test.month, res, test.expDay)
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}
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}
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}
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