Welcome to Poetry Club Door Policy on Exercism's JavaScript Track. If you need help running the tests or submitting your code, check out HELP.md. If you get stuck on the exercise, check out HINTS.md, but try and solve it without using those first :)

Strings are useful for holding data that can be represented in text form. There are two ways to access an individual character in a string.

The first is the charAt() method:

'cat'.charAt(1);
// => "a"

The other way is to treat a string as a list of characters, where individual characters correspond to a numerical index (starts at zero):

'cat'[1];
// => "a"

Some of the most-used operations on strings are to check their length and to concatenate them using the + string operators.

'cat'.length;
// => 3

'I like' + ' ' + 'cats';
// => "I like cats"

A new poetry club has opened in town, and you're thinking of attending. Because there have been incidents in the past, the club has a very specific door policy which you'll need to master, before attempting entry.

There are two doors at the poetry club, both are guarded. In order to gain entry, you'll need to work out the password of that day:

Front door

1. The guard will recite a poem, one line at the time;
   • You will have to respond with the appropriate letter.
2. The guard will tell you all the letters you've responded with at once;
   • You need to format the letters as a capitalised word.

For example, one of their favourite writers is Michael Lockwood, who's written the following acrostic poem, which means that the first letter of each sentence form a word:

Stands so high
Huge hooves too
Impatiently waits for
Reins and harness
Eager to leave

When the guard recites Stands so high, you'll respond S, when the guard recites Huge hooves too, you'll respond H.

Finally the password you write down is Shire, and you'll get in.

Back door

In the back of the club you'll find the most renowned poets, which is like the VIP area. Because this is not for everyone, the back door process is a bit more convoluted.

1. The guard will recite a poem, one line at the time;
   • You will have to respond with the appropriate letter.
2. The guard will tell you all the letters you've responded with at once, but there are sometimes spaces after each sentence:
   • You need to format the letters as a capitalised word
   • and ask nicely, by appending , please

For example, the poem mentioned before is also telestich, which means that the last letter of each sentence form a word:

Stands so high
Huge hooves too
Impatiently waits for
Reins and harness
Eager to leave

When the guard recites Stands so high, you'll respond h, when the guard recites Huge hooves too, you'll respond o.

Finally the password you write down is Horse, please, and you can party with the renowned poets.

Implement a function that returns first letter of a sentence:

frontDoorResponse('Stands so high');
// => "S"

Implement a function that correctly capitalizes a word:

capitalize('SHIRE');
// => "Shire"

capitalize('horse');
// => "Horse"

Implement a function that returns the last letter of a sentence:

backDoorResponse('Stands so high');
// => "h"

Improve the previous function so that it removes whitespace from the end of a sentence and returns the last character:

backDoorResponse('Stands so high   ');
// => "h"

Change the implementation of the backDoorPassword function so that it's polite:

backDoorPassword('horse');
// => "Horse, please"

• @SleeplessByte

• @hayashi-ay