如何在 React Native 中從舊數組獲取新數組？

Question

React Native // 我有一個這樣的數組。 如何從我需要使用的舊數組中獲取新數組？

data = [
    { id: 1, name: 'Mike Mii', city: 'philps', state: 'New York'},
    { id: 2, name: 'Steve Jav', city: 'Square', state: 'Chicago'},
    { id: 3, name: 'Jhonny', city: 'market', state: 'New York'},
    { id: 4, name: 'philps', city: 'booket', state: 'Texas'},
    { id: 5, name: 'smith', city: 'brookfield', state: 'Florida'},
    { id: 6, name: 'Broom', city: 'old street', state: 'Florida'},
  ];

我想得到這樣的數組中有數組的新數組。 字段state相同應該只顯示一個。

new_data = [
    {
      id: 1, 
      state: 'New York',
      people: [ 
        {
          id: 1,
          name: 'Mike Mii',
          city: 'philps',
        },
        {
          id: 2,
          name: 'Jhonny',
          city: 'market',
        }
      ]
    },
    {
      id: 2, 
      state: 'Florida',
      people: [ 
        {
          id: 1,
          name: 'smith',
          city: 'brookfield',
        },
        {
          id: 2,
          name: 'Broom',
          city: 'old street',
        }
      ]
    },
    {
      id: 3, 
      state: 'Chicago',
      people: [ 
        {
          id: 1,
          name: 'Steve Jav',
          city: 'Square',
        }
      ]
    },
    {
      id: 4, 
      state: 'Texas',
      people: [ 
        {
          id: 1,
          name: 'philps',
          city: 'booket',
        }
      ]
    }
  ];

Answer 1

這應該做。

 const data = [ { id: 1, name: 'Mike Mii', city: 'philps', state: 'New York' }, { id: 2, name: 'Steve Jav', city: 'Square', state: 'Chicago' }, { id: 3, name: 'Jhonny', city: 'market', state: 'New York' }, { id: 4, name: 'philps', city: 'booket', state: 'Texas' }, { id: 5, name: 'smith', city: 'brookfield', state: 'Florida' }, { id: 6, name: 'Broom', city: 'old street', state: 'Florida' }, ]; const result = data.reduce((p, c) => { const found = p.findIndex(p => p.state === c.state); if (found.== -1) { delete c;state. p[found].people;push(c). } else { p:push({ id. p,length + 1: state. c,state: people: [{ id. c,id: name. c,name: city. c,city }] }) } return p }; []). console;log(result);