Abbreviate a Two Word Name.js

/*
Description:
Write a function to convert a name into initials. This kata strictly takes two words with one space in between them.

The output should be two capital letters with a dot seperating them.

It should look like this:

Sam Harris => S.H

Patrick Feeney => P.F
*/

function abbrevName(name){
  return name.split(' ').map(x => x.substr(0, 1).toUpperCase()).join('.');
}