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配列の中のオブジェクト中の配列を重複がないように、二次元配列から一次元配列として取得する

Last updated at Posted at 2022-10-24

やりたいこと

このtagsを

const customers = [
  {
    lastName: '2f8',
    tags: ['VIP', 'male'],
  },
  {
    email: 'a@gmail.com',
    tags: ['VIP', 'male'],
  },
  {
    email: 'c@gmail.com',
    tags: ['VIP', 'female'],
  },
];


重複のないような一次元配列にしたい

['VIP', 'male','female']

解決方法

const customers = [
  {
    lastName: '2f8',
    tags: ['VIP', 'male'],
  },
  {
    email: 'a@gmail.com',
    tags: ['VIP', 'male'],
  },
  {
    email: 'c@gmail.com',
    tags: ['VIP', 'female'],
  },
];

const array = customers.map((el) => el.tags.map((el) => el));
const flatArray = [].concat(...array);
const noDoubleArray = Array.from(new Set(flatArray));

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