Vorgang zum Entfernen von Objekten, die dem Array-Wert entsprechen

Question

Ich habe ein Objektarray und ein normales Array, und wenn ein Element im Objektarray einem Element im normalen Array entspricht, möchte ich es entfernen. Das verwirrt mich.

Das habe ich bisher versucht:

<code>var states =
[
{ChoicesID: ​​​​1, ChoicesName: 'afghanistan'},
{ChoicesID: ​​​​2, ChoicesName: 'Albanien'},
{ChoicesID: ​​​​3, ChoicesName: 'Algerien'},
{ChoicesID: ​​​​4, ChoicesName: 'angola'},
{ChoicesID: ​​​​5, ChoicesName: 'argentina'},
{ChoicesID: ​​​​6, ChoicesName: 'armenia'}
];

var answer = ['afghanistan','albanien','algerien'];

var ChoicesName = new Set(countries.map(d => d.ChoicesName));
var NewCountries = [...ChoicesName, ...answer.filter(d => !ChoicesName.has(countries.find(o => o.ChoicesName === Antwort)))];
console.log(NewCountries);</code>

Die erwartete Ausgabe sollte wie folgt aussehen:

var NewCountries =
     [
       {ChoicesID: ​​​​4, ChoicesName: 'angola'},
       {ChoicesID: ​​​​5, ChoicesName: 'argentina'},
       {ChoicesID: ​​​​6, ChoicesName: 'armenia'}
     ];

Answer 1

var countries = 
[
{ChoicesID: 1, ChoicesName : '阿富汗'},
{ChoicesID: 2, ChoicesName : '阿尔巴尼亚'},
{ChoicesID: 3, ChoicesName : '阿尔及利亚'},
{ChoicesID: 4, ChoicesName : '安哥拉'},
{ChoicesID: 5, ChoicesName : '阿根廷'},
{ChoicesID: 6, ChoicesName : '亚美尼亚'}
];

var answer = ['阿富汗','阿尔巴尼亚','阿尔及利亚'];

var NewCountries = countries.filter(o => !answer.includes(o.ChoicesName))

console.log(NewCountries)

像这样？

Answer 2

使用 filter 并删除如果 answer 中存在它。创建一个 answerSet 以进行 O(1) 的查找，否则可以使用 includes，但 includes 的时间复杂度为 O(m)（其中 m 是 answer 数组中的元素数量，n 是 countries 数组中的元素数量）

使用 set
O(m) + O(n).O(1) = O(n)（给定 n>m）

使用 includes
O(n).O(m) = O(nm)

var countries = [{ChoicesID: 1, ChoicesName : 'afghanistan'},{ChoicesID: 2, ChoicesName : 'albania'},{ChoicesID: 3, ChoicesName : 'algeria'},{ChoicesID: 4, ChoicesName : 'angola'},{ChoicesID: 5, ChoicesName : 'argentina'},{ChoicesID: 6, ChoicesName : 'armenia'}];
var answer = ['afghanistan','albania','algeria'];

const answerSet = new Set(answer)

const newCountries = countries.filter(c => !answerSet.has(c.ChoicesName))

console.log(newCountries)