marvel-fp.js

var comics = [
  {
    pages: 100,
    price: 100
  },
  {
    pages: 100,
    price: 50
  },
  {
    pages: 50,
    price: 10
  }
];

var filterLte50 = _.filter(function(num) {
  return num <= 50;
});

var filterLt100 = _.filter(function(num) {
  return num < 50;
});

var filterPriceLte50 = _.flowRight([filterLte50, _.map(_.prop('price'))]);

var filterPagesLt100 = _.flowRight([filterLt100, _.map(_.prop('pages'))]);

console.log(filterPagesLt100(comics));