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Calculate the Most Frequent Weekdays in Go


The problem

What’s your favorite day of the week? Test if it’s essentially the most frequent day of the week within the yr.

You’re given a yr as integer (e. g. 2001). You must return essentially the most frequent day(s) of the week in that yr. The consequence needs to be a listing of days sorted by the order of days in week (e. g. ['Monday', 'Tuesday']['Saturday', 'Sunday']['Monday', 'Sunday']). Week begins with Monday.

Enter: Yr as an int.

Output: The checklist of most frequent days sorted by the order of days in week (from Monday to Sunday).

Preconditions:

  • Week begins on Monday.
  • Yr is between 1583 and 4000.
  • Calendar is Gregorian.

Instance:

MostFrequentDays(2427) == []string{"Friday"}
MostFrequentDays(2185) == []string{"Saturday"}
MostFrequentDays(2860) == []string{"Thursday", "Friday"}

The answer in Golang

Choice 1:

bundle mostfrequentdays
import (
  "time"
)
func MostFrequentDays(yr int) []string {
  beg := time.Date(yr, time.January, 1, 0, 0, 0, 0, time.UTC).Weekday()
  finish := time.Date(yr, time.December, 31, 0, 0, 0, 0, time.UTC).Weekday()
  if beg == finish {
    return []string{beg.String()}
  }
  if beg == time.Sunday {
    beg, finish = finish, beg
  }
  return []string{beg.String(), finish.String()}
} 

Choice 2:

bundle mostfrequentdays
import "time"
func MostFrequentDays(yr int) (consequence []string) {
  jan_1 := time.Date(yr, time.January, 1, 0, 0, 0, 0, time.UTC)
  consequence = append(consequence, jan_1.Weekday().String())  
  if yr % 4 == 0 {
    jan_2 := jan_1.Add(24*time.Hour)
    if consequence[0] == "Sunday" {
      consequence = append([]string{jan_2.Weekday().String()}, consequence...)
    } else {
      consequence = append(consequence, jan_2.Weekday().String())
    }
  }  
  return consequence
}

Choice 3:

bundle mostfrequentdays
import ("time";"kind")
func MostFrequentDays(yr int) (r []string) {
  first := time.Date(yr, 1, 1, 0, 0, 0, 0, time.UTC)
  final := time.Date(yr, 12, 1, 0, 0, 0, 0, time.UTC).AddDate(0, 1, -1)
  for {
    r = append(r, first.Weekday().String())
    if first.Weekday() == final.Weekday() { break }
    first = first.Add(24 * time.Hour)
  }
  m := map[string]int{"Monday": 1, "Tuesday": 2, "Wednesday": 3, "Thursday": 4, "Friday": 5, "Saturday": 6, "Sunday": 7}
  kind.Slice(r, func(i, j int) bool { return m[r[i]] < m[r[j]] })
  return
}

Take a look at circumstances to validate our resolution

bundle mostfrequentdays_test
import (
  . "github.com/onsi/ginkgo"
  . "github.com/onsi/gomega"
)
func check(enter int, anticipated ...string) {
  Anticipate(MostFrequentDays(enter)).To(Equal(anticipated))
}
var _ = Describe("Pattern Checks", func() {
  It("Pattern Checks", func() {
    check(2427, "Friday")
    check(2185, "Saturday")
    check(1167, "Sunday")
    check(1770, "Monday")
    check(1785, "Saturday")
    check(1984, "Monday", "Sunday")
    check(3076, "Saturday", "Sunday")
  })
})
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