使用typescript

Question

我想使用typescript从数组中批量删除。

我是通过使用for循环来完成的。

this.versions = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
this.selectedVersions = [1, 2, 3, 4, 5, 6];
for (let i = 0; i < this.selectedVersions.length; i++) {
  this.versions = this.removeObjectFromArray(this.versions, this.selectedVersions[i]);
}


//removing a object from array
removeObjectFromArray(listOfdata: any, data: any) {
  let index = listOfdata.findIndex(function (o) {
    return o === data;
  })
  listOfdata.splice(index, 1);
  return listOfdata;
}

但我不喜欢使用for loop。所以让我知道如何使用typescript在数组中进行批量删除。

Answer 1

您可以使用数组过滤器：

＆＃13;

＆＃13;

var versions = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
var selectedVersions = [1, 2, 3, 4, 5, 6];

versions = versions.filter(el => !selectedVersions.includes(el));
console.log(versions);

＆＃13;

＆＃13;

＆＃13;

Answer 2

利用array.filter并根据条件

过滤数组的内容

＆＃13;

＆＃13;

let versions = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
let selectedVersions = [1, 2, 3, 4, 5, 6];
versions = versions.filter(arrayVal => selectedVersions.indexOf(arrayVal) == -1 );
// checks for the values of selected Versions agains each value of versions and returns accordindly
console.log(versions)

＆＃13;

＆＃13;

＆＃13;

Answer 3

使用过滤器

// will only keep elements that are not included in selectedVersions
this.versions = this.versions.filter(i => !this.selectedVersions.includes(i));

Answer 4

我认为您可以使用indexOf，如下所示：

this.versions = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
this.selectedVersions = [1, 2, 3, 4, 5, 6];
  for (let i = 0; i < this.selectedVersions.length; i++)  
  {  
if(this.versions.indexOf(this.selectedVersions[i])!==-1){
this.versions.splice(index, 1);
}
  }

Answer 5

我个人会使用过滤器来保存原始数组：

let nonSelectedVersions = this.versions.filter((e) => this.selectedVersions.indexOf(e) !== -1);

Answer 6

使用array.filter（）而不是for循环

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

Answer 7

Typescript与javascript相同，你可以从JS获得你所有的知识。

How do I remove a particular element from an array in JavaScript?

如果TS编译器支持

，也可以使用for-of循环

var versions = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
var selectedVersions = [1, 2, 3, 4, 5, 6];
    for ( val of  selectedVersions)  {        
       if(selectedVersions.indexOf(val)!=-1){
           versions.splice(versions.indexOf(val), 1);
       }
    }