two.js

// more 5 line functions

function project( obj, ...slots ) {
  slots = new Set(slots);
  const pslots = Object.keys( obj ).filter( k => slots.has(k) );
  return pslots.reduce( (p,k) => (k.includes('.') ? p[k] = resolve(obj,k) : p[k]=obj[k],p), {});
}

function resolve( obj, path ) {
  // FIXME: if key == '.' this will break. :)
  path = path.split(/\./g);
  while(obj !== null && obj !== undefined && path.length) {
    obj = obj[path.shift()];
  }
  return obj;
}