Calculate the date of meetups.
Typically meetups happen on the same day of the week. In this exercise, you will take a description of a meetup date, and return the actual meetup date.
Examples of general descriptions are:
The descriptors you are expected to parse are: first, second, third, fourth, fifth, last, monteenth, tuesteenth, wednesteenth, thursteenth, friteenth, saturteenth, sunteenth
Note that "monteenth", "tuesteenth", etc are all made up words. There was a meetup whose members realized that there are exactly 7 numbered days in a month that end in '-teenth'. Therefore, one is guaranteed that each day of the week (Monday, Tuesday, ...) will have exactly one date that is named with '-teenth' in every month.
Given examples of a meetup dates, each containing a month, day, year, and descriptor calculate the date of the actual meetup. For example, if given "The first Monday of January 2017", the correct meetup date is 2017/1/2.
Go through the setup instructions for Javascript to install the necessary dependencies:
https://exercism.io/tracks/javascript/installation
Install assignment dependencies:
$ npm install
Execute the tests with:
$ npm test
In the test suites all tests but the first have been skipped.
Once you get a test passing, you can enable the next one by changing xtest
to
test
.
Jeremy Hinegardner mentioned a Boulder meetup that happens on the Wednesteenth of every month https://twitter.com/copiousfreetime
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
import { meetupDay } from './meetup';
describe('meetupDay()', () => {
test('test monteenth of may 2013', () => {
expect(meetupDay(2013, 4, 'Monday', 'teenth')).toEqual(new Date(2013, 4, 13));
});
xtest('test saturteenth of february 2013', () => {
expect(meetupDay(2013, 1, 'Saturday', 'teenth')).toEqual(new Date(2013, 1, 16));
});
xtest('test first tuesday of may 2013', () => {
expect(meetupDay(2013, 4, 'Tuesday', '1st')).toEqual(new Date(2013, 4, 7));
});
xtest('test second monday of april 2013', () => {
expect(meetupDay(2013, 3, 'Monday', '2nd')).toEqual(new Date(2013, 3, 8));
});
xtest('test third thursday of september 2013', () => {
expect(meetupDay(2013, 8, 'Thursday', '3rd')).toEqual(new Date(2013, 8, 19));
});
xtest('test fourth sunday of march 2013', () => {
expect(meetupDay(2013, 2, 'Sunday', '4th')).toEqual(new Date(2013, 2, 24));
});
xtest('test last thursday of october 2013', () => {
expect(meetupDay(2013, 9, 'Thursday', 'last')).toEqual(new Date(2013, 9, 31));
});
xtest('test last wednesday of february 2012', () => {
expect(meetupDay(2012, 1, 'Wednesday', 'last')).toEqual(new Date(2012, 1, 29));
});
xtest('test last wednesday of december 2014', () => {
expect(meetupDay(2014, 11, 'Wednesday', 'last')).toEqual(new Date(2014, 11, 31));
});
xtest('test last sunday of only four week february 2015', () => {
expect(meetupDay(2015, 1, 'Sunday', 'last')).toEqual(new Date(2015, 1, 22));
});
xtest('test first friday of december 2012', () => {
expect(meetupDay(2012, 11, 'Friday', '1st')).toEqual(new Date(2012, 11, 7));
});
xtest('test fifth monday of march 2015', () => {
expect(meetupDay(2015, 2, 'Monday', '5th')).toEqual(new Date(2015, 2, 30));
});
xtest('test nonexistent fifth monday of february 2015', () => {
expect(() => {
meetupDay(2015, 1, 'Monday', '5th');
}).toThrow();
});
});
//
// This is only a SKELETON file for the 'Meetup' exercise. It's been provided as a
// convenience to get you started writing code faster.
//
const schedules = {
'teenth': 13,
'1st': 1,
'2nd': 8,
'3rd': 15,
'4th': 22,
'5th': 29,
'last': 0
}
const daysOfWeek = {
Sunday: 0,
Monday: 1,
Tuesday: 2,
Wednesday: 3,
Thursday: 4,
Friday: 5,
Saturday: 6
}
export const meetupDay = (year, month, dayOfWeek, schedule) => {
let daysInMonth = new Date(year, month +1, 0).getDate();
let dayOfMonth = 1;
if (daysInMonth === 28 && new Date(year, month, 1).getDay() === 0 && schedule === '5th') {
throw `${month} ${year} does not contain a 5th week.`;
}
if(schedule === 'last') {
for (let day = daysInMonth; day >= 1; day--) {
if(new Date(year, month, day).getDay() == daysOfWeek[dayOfWeek]) {
dayOfMonth = day;
break;
}
}
}
else {
for (let day = schedules[schedule]; day <= daysInMonth; day++) {
if(new Date(year, month, day).getDay() == daysOfWeek[dayOfWeek]) {
dayOfMonth = day;
break;
}
}
}
return new Date(year, month, dayOfMonth);
}
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