7urtle-rabbit-hole.js

import {trim, upperCaseOf, lengthOf, lastLetterOf, includes, compose} from '@7urtle/lambda';

const endsWithPunctuation = input =>
  includes(lastLetterOf(input))('.?,!');

const replacePunctuationWithExclamation = input =>
  substr(lengthOf(input) - 1)(0)(input) + '!';

const addExclamationMark = input =>
  endsWithPunctuation(input)
    ? replacePunctuationWithExclamation(input)
    : input + '!';

const shout = compose(addExclamationMark, upperCaseOf, trim);

shout(" Don't forget to feed the turtle.");
// => DON'T FORGET TO FEED THE TURTLE!