[Codewars] Meeting (6 kyu) / JavaScript

https://www.codewars.com/kata/59df2f8f08c6cec835000012

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DESCRIPTION:

John has invited some friends. His list is:

s = "Fred:Corwill;Wilfred:Corwill;Barney:Tornbull;Betty:Tornbull;Bjon:Tornbull;Raphael:Corwill;Alfred:Corwill";

Could you make a program that

• makes this string uppercase
• gives it sorted in alphabetical order by last name.

When the last names are the same, sort them by first name. Last name and first name of a guest come in the result between parentheses separated by a comma.

So the result of function meeting(s) will be:

"(CORWILL, ALFRED)(CORWILL, FRED)(CORWILL, RAPHAEL)(CORWILL, WILFRED)(TORNBULL, BARNEY)(TORNBULL, BETTY)(TORNBULL, BJON)"

It can happen that in two distinct families with the same family name two people have the same first name too.

 

Notes

• You can see another examples in the "Sample tests".

 

코드

function meeting(s) {
  return s.toUpperCase().split(';').map(el => el.split(':').reverse()).sort().map(el => `(${el.join(', ')})`).join('');
}