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const pipe = (fn,...fns) => (...args) => !fns.length ? fn(...args) : pipe(...fns)(fn(...args));

const getKittens = 
  cats => cats.filter(cat => cat.months < 7);

const namesToList = 
  listOfObjects => listOfObjects.map(ob => ob.name);

const getKittenNames = pipe(getKittens, namesToList);

const cats = [
  { name: 'Mojo',    months: 84 },
  { name: 'Mao-Mao', months: 34 },
  { name: 'Waffles', months: 4 },
  { name: 'Pickles', months: 6 }
];

const kittenNames = getKittenNames(cats);

console.log(kittenNames);