egghead Reduce Data with JS array.js

// composing functions using reduce
function increment(input) { return input + 1;}
function decrement(input) { return input - 1; }
function double(input) { return input * 2; }
function halve(input) { return input / 2; }

var initial_value = 1;

var pipeline = [
  increment,
  increment,
  increment,
  double,
  increment,
  increment,
  halve
];

var final_value = pipeline.reduce(function(acc, fn) {
  return fn(acc);
}, initial_value);

var reversed = pipeline.reduceRight(function(acc, fn) {
  return fn(acc);
}, initial_value)

console.log("final_value: ", final_value)
console.log("reversed: ", reversed)

------------------------------------------
// inspect nested object using reduce
var luke = {
  name: "luke skywalker",
  jedi: true,
  parents: {
    father: {
      jedi: true
    },
    mother: {
      jedi: false
    }
  }
}

var han = {
  name: "han solo",
  jedi: false,
  parents: {
    father: {
      jedi: false
    },
    mother: {
      jedi: false
    }
  }
}

var anakin = {
  name: "anakin skywalker",
  jedi: true,
  parents: {
    mother: {
      jedi: false
    }
  }
}

var characters = [luke, han, anakin];

function fatherWasJedi(character) {
  var path = "parents.father.jedi";
  return path.split(".").reduce(function(obj, field) {
    if (obj) {
      return obj[field];
    }

    return false;
  }, character);
}

characters.forEach(function(character) {
  console.log(character.name + "'s father was a jedi:", fatherWasJedi(character)) 
});