Javascriptの配列（Object型編）の基本まとめ

前回に続きJavascriptの配列の基本についてです。今回はあくまでObject型についてです。

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基本形

const member = {
  name: 'Yamada Taro',
  age: 62,
};

console.log(member);
//出力
//{name: "Yamada Taro", age: 62}

console.log(member.name);
//出力
//Yamada Taro

 

要素の追加と削除

const member = {
name: 'Yamada Taro',
age: 62,
};

member.email = 'yamada@aaa.jp';
console.log(member);
//出力
//{name: "Yamada Taro", age: 62, email: "yamada@aaa.jp"}

delete member.age;
console.log(member);
//出力
//{name: "Yamada Taro", email: "yamada@aaa.jp"}
 

 

KeyとValueの操作

const member = {
  name: 'Yamada Taro',
  age: 62,
};

console.log(Object.keys(member));
console.log(Object.values(member));
//出力:
//["name", "age"]
//["Yamada Taro", 62]

Object.keys(member).forEach(key => {
  console.log(key +" : "+ member[key]);
});
//出力:
//name : Yamada Taro
//age : 62
 

 

二重配列

const members = {
  member1: {
    name: 'Yamada Taro',
    age: 62,
  },
  member2: {
    name: 'Suzuki Takashi',
    age: 48,
  },
};
console.log(members);
//出力
//member1: {name: "Yamada Taro", age: 62}
//member2: {name: "Suzuki Takashi", age: 48}__proto__: Object

console.log(members.member1);
//出力
//{name: "Yamada Taro", age: 62}

console.log(members.member1.name);
//出力
//Yamada Taro
 

 

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 - HTML/JavaScript