Immune

Finished
44//
55
66/**
7 * @param {number} year
8 * @param {number} month
9 * @param {string} week
10 * @param {string} dayOfWeek
11 * @returns {Date}
7 * Calculates the date of a meetup based on year, month, week, and day of week.
8 *
9 * @param {number} year - The year of the meetup
10 * @param {number} month - The month of the meetup (1-12)
11 * @param {string} week - The week descriptor ('first', 'second', 'third', 'fourth', 'last', 'teenth')
12 * @param {string} dayOfWeek - The day of week ('Sunday', 'Monday', etc.)
13 * @returns {Date} - The calculated date of the meetup
14 *
15 * @example
16 * meetup(2018, 1, 'first', 'Monday') // Returns Date for January 1, 2018
17 * meetup(2020, 5, 'teenth', 'Wednesday') // Returns Date for May 13, 2020
1218 */
1319export const meetup = (year, month, week, dayOfWeek) => {
14 throw new Error('Remove this line and implement the function');
20 // Validate inputs
21 if (!Number.isInteger(year) || year < 1) {
22 throw new Error('Invalid year');
23 }
24
25 if (!Number.isInteger(month) || month < 1 || month > 12) {
26 throw new Error('Invalid month');
27 }
28
29 const validWeeks = ['first', 'second', 'third', 'fourth', 'last', 'teenth'];
30 if (!validWeeks.includes(week)) {
31 throw new Error('Invalid week');
32 }
33
34 const validDays = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
35 if (!validDays.includes(dayOfWeek)) {
36 throw new Error('Invalid day of week');
37 }
38
39 // Map day names to numbers (0 = Sunday, 1 = Monday, ..., 6 = Saturday)
40 const dayOfWeekNumber = validDays.indexOf(dayOfWeek);
41
42 // Create a date object for the first day of the month
43 const firstDay = new Date(year, month - 1, 1);
44
45 // Edge Case: Handle 'teenth' week (13th through 19th)
46 if (week === 'teenth') {
47 // Start from the 13th day of the month
48 const teenthStart = new Date(year, month - 1, 13);
49
50 // Find the first matching day of week on or after the 13th
51 let currentDay = teenthStart;
52 while (currentDay.getDay() !== dayOfWeekNumber) {
53 currentDay.setDate(currentDay.getDate() + 1);
54 }
55
56 // Verify we're still in the same month (should always be true for valid inputs)
57 if (currentDay.getMonth() !== month - 1) {
58 throw new Error('Could not find teenth day');
59 }
60
61 return currentDay;
62 }
63
64 // Edge Case: Handle 'last' week
65 if (week === 'last') {
66 // Get the last day of the month
67 const lastDay = new Date(year, month, 0); // 0th day of next month = last day of current month
68
69 // Find the last matching day of week in the month
70 let currentDay = new Date(lastDay);
71 while (currentDay.getDay() !== dayOfWeekNumber) {
72 currentDay.setDate(currentDay.getDate() - 1);
73 }
74
75 return currentDay;
76 }
77
78 // Edge Case: Handle 'first', 'second', 'third', 'fourth' weeks
79 // Map week names to their occurrence number
80 const weekNumber = {
81 'first': 1,
82 'second': 2,
83 'third': 3,
84 'fourth': 4
85 }[week];
86
87 // Find the first matching day of week in the month
88 let currentDay = new Date(firstDay);
89 while (currentDay.getDay() !== dayOfWeekNumber) {
90 currentDay.setDate(currentDay.getDate() + 1);
91 }
92
93 // Add the appropriate number of weeks
94 currentDay.setDate(currentDay.getDate() + (weekNumber - 1) * 7);
95
96 // Edge Case: Verify the resulting date is still in the same month
97 if (currentDay.getMonth() !== month - 1) {
98 throw new Error(`There is no ${week} ${dayOfWeek} in the specified month`);
99 }
100
101 return currentDay;
15102};
103
104// Handled Edge Cases: Invalid inputs (year, month, week, dayOfWeek), teenth week calculation, last week calculation, first-fourth week calculation, date overflow to next month
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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