Javascript过滤嵌套数组

Question

我正在尝试在Angular应用程序中的对象数组内的嵌套数组上过滤a。这是组件代码的片段-

var teams = [
  { name: 'Team1', members: [{ name: 'm1' }, { name: 'm2' }, { name: 'm3' }] }, 
  { name: 'Team2', members: [{ name: 'm4' }, { name: 'm5' }, { name: 'm6' }] }, 
  { name: 'Team3', members: [{ name: 'm7' }, { name: 'm8' }, { name: 'm9' }] }
];

我要达到的目标是m5，例如，如果搜索，我的结果应该是-

var teams = [
  { name: 'Team1', members: [] }, 
  { name: 'Team2', members: [{ name: 'm5' }] }, 
  { name: 'Team3', members: [] }
];

所以，我有teams和filteredTeams性能，并在我的搜索功能，我做-

onSearchChange(event: any): void {
  let value = event.target.value;
  this.filteredTeams = this.teams.map(t => {
    t.members = t.members.filter(d => d.name.toLowerCase().includes(value));
    return t;
  })
}

现在，这确实在某种程度上起作用了，因为我要替换成员，这会破坏每次调用时的数组（如果这样的话）。我了解为什么会发生这种情况，但我的问题是实现此过滤器的最佳方法是什么？

Answer 1

检查一下。不用硬编码m5传递您的价值。

const teams = [
  { name: 'Team1', members: [{ name: 'm1' }, { name: 'm2' }, { name: 'm3' }] }, 
  { name: 'Team2', members: [{ name: 'm4' }, { name: 'm5' }, { name: 'm6' }] }, 
  { name: 'Team3', members: [{ name: 'm7' }, { name: 'm8' }, { name: 'm9' }] }
];

const filteredTeams = teams.map(team => ({ name: team.name, members: team.members.filter(member => member.name.includes('m5')) }));

console.log(filteredTeams);

Answer 2

你已经非常接近了，你唯一做错的就是改变了源对象teams

基本上，您可以使用扩展运算符生成一个新条目，然后返回一个包含新值的全新数组。

const teams = [
  { name: 'Team1', members: [{ name: 'm1' }, { name: 'm2' }, { name: 'm3' }] }, 
  { name: 'Team2', members: [{ name: 'm4' }, { name: 'm5' }, { name: 'm6' }] }, 
  { name: 'Team3', members: [{ name: 'm7' }, { name: 'm8' }, { name: 'm9' }] }
];

const value = 'm5';

const result = teams.map(t => {
  const members = t.members.filter(d => d.name.toLowerCase().includes(value));
  return { ...t, members };
})

console.log(result)