lexicon

Finished
1//
2// This is only a SKELETON file for the 'Meetup' exercise. It's been provided as a
3// convenience to get you started writing code faster.
4//
1const weekdays = {
2 sunday: 0,
3 monday: 1,
4 tuesday: 2,
5 wednesday: 3,
6 thursday: 4,
7 friday: 5,
8 saturday: 6
9};
510
611/**
7 * @param {number} year
8 * @param {number} month
9 * @param {string} week
10 * @param {string} dayOfWeek
11 * @returns {Date}
12 * Calculates the date of a meetup based on year, month, week descriptor, and day of week.
13 *
14 * @param {number} year - The year of the meetup
15 * @param {number} month - The month of the meetup (1-12)
16 * @param {string} week - The week descriptor ('first', 'second', 'third', 'fourth', 'last', 'teenth')
17 * @param {string} dayOfWeek - The day of week ('sunday', 'monday', ..., 'saturday')
18 * @returns {Date} - The calculated date of the meetup
19 *
20 * Handled Edge Cases:
21 * - Invalid month values (outside 1-12)
22 * - Invalid week descriptors
23 * - Invalid day of week names
24 * - Last week of month when there are only 4 occurrences of a day
25 * - Teenth week calculations
1226 */
1327export const meetup = (year, month, week, dayOfWeek) => {
14 throw new Error('Remove this line and implement the function');
28 // Edge Case: Validate month is in valid range
29 if (month < 1 || month > 12) {
30 throw new Error('Invalid month');
31 }
32
33 // Edge Case: Validate dayOfWeek is valid
34 const dayIndex = weekdays[dayOfWeek.toLowerCase()];
35 if (dayIndex === undefined) {
36 throw new Error('Invalid day of week');
37 }
38
39 // Edge Case: Validate week descriptor is valid
40 const validWeeks = ['first', 'second', 'third', 'fourth', 'last', 'teenth'];
41 if (!validWeeks.includes(week.toLowerCase())) {
42 throw new Error('Invalid week descriptor');
43 }
44
45 // Create a date object for the first day of the month
46 const firstDay = new Date(year, month - 1, 1);
47
48 // For 'last' week, we start from the last day of the month
49 if (week.toLowerCase() === 'last') {
50 // Get the last day of the month
51 const lastDay = new Date(year, month, 0);
52
53 // Find the last occurrence of the target day
54 const daysAfter = (lastDay.getDay() - dayIndex + 7) % 7;
55 return new Date(lastDay.getFullYear(), lastDay.getMonth(), lastDay.getDate() - daysAfter);
56 }
57
58 // For 'teenth' week, we check days 13-19
59 if (week.toLowerCase() === 'teenth') {
60 for (let day = 13; day <= 19; day++) {
61 const date = new Date(year, month - 1, day);
62 if (date.getDay() === dayIndex) {
63 return date;
64 }
65 }
66 }
67
68 // For first through fourth, we calculate based on the occurrence
69 const weekIndex = ['first', 'second', 'third', 'fourth'].indexOf(week.toLowerCase());
70
71 // Find the first occurrence of the target day
72 const firstOccurrence = (dayIndex - firstDay.getDay() + 7) % 7 + 1;
73
74 // Calculate the target date
75 const targetDate = firstOccurrence + weekIndex * 7;
76
77 // Edge Case: Check if the calculated date is still in the same month
78 const result = new Date(year, month - 1, targetDate);
79 if (result.getMonth() !== month - 1) {
80 throw new Error('Invalid date');
81 }
82
83 return result;
1584};
Test NameStatus
monteenth of May 2013
Pass
monteenth of August 2013
Pass
monteenth of September 2013
Pass
tuesteenth of March 2013
Pass
tuesteenth of April 2013
Pass
tuesteenth of August 2013
Pass
wednesteenth of January 2013
Pass
wednesteenth of February 2013
Pass
wednesteenth of June 2013
Pass
thursteenth of May 2013
Pass
thursteenth of June 2013
Pass
thursteenth of September 2013
Pass
friteenth of April 2013
Pass
friteenth of August 2013
Pass
friteenth of September 2013
Pass
saturteenth of February 2013
Pass
saturteenth of April 2013
Pass
saturteenth of October 2013
Pass
sunteenth of May 2013
Pass
sunteenth of June 2013
Pass
sunteenth of October 2013
Pass
first Monday of March 2013
Pass
first Monday of April 2013
Pass
first Tuesday of May 2013
Pass
first Tuesday of June 2013
Pass
first Wednesday of July 2013
Pass
first Wednesday of August 2013
Pass
first Thursday of September 2013
Pass
first Thursday of October 2013
Pass
first Friday of November 2013
Pass
first Friday of December 2013
Pass
first Saturday of January 2013
Pass
first Saturday of February 2013
Pass
first Sunday of March 2013
Pass
first Sunday of April 2013
Pass
second Monday of March 2013
Pass
second Monday of April 2013
Pass
second Tuesday of May 2013
Pass
second Tuesday of June 2013
Pass
second Wednesday of July 2013
Pass
second Wednesday of August 2013
Pass
second Thursday of September 2013
Pass
second Thursday of October 2013
Pass
second Friday of November 2013
Pass
second Friday of December 2013
Pass
second Saturday of January 2013
Pass
second Saturday of February 2013
Pass
second Sunday of March 2013
Pass
second Sunday of April 2013
Pass
third Monday of March 2013
Pass
third Monday of April 2013
Pass
third Tuesday of May 2013
Pass
third Tuesday of June 2013
Pass
third Wednesday of July 2013
Pass
third Wednesday of August 2013
Pass
third Thursday of September 2013
Pass
third Thursday of October 2013
Pass
third Friday of November 2013
Pass
third Friday of December 2013
Pass
third Saturday of January 2013
Pass
third Saturday of February 2013
Pass
third Sunday of March 2013
Pass
third Sunday of April 2013
Pass
fourth Monday of March 2013
Pass
fourth Monday of April 2013
Pass
fourth Tuesday of May 2013
Pass
fourth Tuesday of June 2013
Pass
fourth Wednesday of July 2013
Pass
fourth Wednesday of August 2013
Pass
fourth Thursday of September 2013
Pass
fourth Thursday of October 2013
Pass
fourth Friday of November 2013
Pass
fourth Friday of December 2013
Pass
fourth Saturday of January 2013
Pass
fourth Saturday of February 2013
Pass
fourth Sunday of March 2013
Pass
fourth Sunday of April 2013
Pass
last Monday of March 2013
Pass
last Monday of April 2013
Pass
last Tuesday of May 2013
Pass
last Tuesday of June 2013
Pass
last Wednesday of July 2013
Pass
last Wednesday of August 2013
Pass
last Thursday of September 2013
Pass
last Thursday of October 2013
Pass
last Friday of November 2013
Pass
last Friday of December 2013
Pass
last Saturday of January 2013
Pass
last Saturday of February 2013
Pass
last Sunday of March 2013
Pass
last Sunday of April 2013
Pass
last Wednesday of February 2012
Pass
last Wednesday of December 2014
Pass
last Sunday of February 2015
Pass
first Friday of December 2012
Pass

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