Cacher is the code snippet organizer for pro developers

var members = [
  {
    name: 'Yamada Takami',
    age: 35
  },
  {
    name: 'Yamada Yukihisa',
    age: 30
  },
  {
    name: 'Oyamada Akihiro',
    age: 34
  }
];

var average =  members.reduce(function (acc, object) {
  return acc + object.age
}, 0) / members.length;

console.log(average);
// 33

var data = [
  {
    name: 'Yamada Takami',
    twitter: 'tacamy'
  },
  {
    name: 'Yamada Yukihisa',
    twitter: 'ykhs'
  }
];

var users = {};

var users = data.reduce(function (acc, object) {
  acc[object.twitter] = object.name;
  //   key                 value
  return acc;
}, {});

console.log(users);
// {tacamy: "Yamada Takami", ykhs: "Yamada Yukihisa"}

var array = [1, 3, 5, 7];

var result = array.reduce(function (previous, current) {
  console.log('previous: ' + previous + ' current: ' + current);
  return previous + current;
}, 10); // 初期値に10を設定

console.log('result: ' + result);
// previous: 10 current: 1
// previous: 11 current: 3
// previous: 14 current: 5
// previous: 19 current: 7
// result: 26

var data = [5,6,7,8];
var result = data.reduce(function(a,b){
  return a + b;
});
console.log(result);//26

// 2つの値の合計値を求める関数
function add(a, b) {
  return a + b;
}

var array = [1, 3, 5, 7];

var result = array.reduce(add);

console.log(result);
// 16