Question

有这样一个数据数组。如何使用lodash方法_.filter通过parentTd（数组“ parentIds”之一）实现过滤？

"terms": [{
      "id": 13,
      "name": 'illustrator',
      "parentIds": [2, 4],
      "isCompanyArea": false
    },
    {
      "id": 14,
      "name": 'figma',   
      "parentIds": [2, 3],
      "isCompanyArea": true
    },
    {
      "id": 15,
      "name": 'sas',
      "parentIds": [3 ,4, 2],
      "isCompanyArea": false
    },
    {
      "id": 16,
      "name": 'jmp',
      "parentIds": [3],
      "isCompanyArea": false
    },
    {
      "id": 17,
      "name": 'docker',
      "parentIds": [4, 5],
      "isCompanyArea": false
    }]

Answer 1

You can use Array.filter() and Array.includes():

const getAllChildrenById = searchParentId =>
  terms.filter(({ parentIds }) => parentIds.includes(searchParentId))

const terms = [{"id":13,"name":"illustrator","parentIds":[2,4],"isCompanyArea":false},{"id":14,"name":"figma","parentIds":[2,3],"isCompanyArea":true},{"id":15,"name":"sas","parentIds":[3,4,2],"isCompanyArea":false},{"id":16,"name":"jmp","parentIds":[3],"isCompanyArea":false},{"id":17,"name":"docker","parentIds":[4,5],"isCompanyArea":false}]

const result = getAllChildrenById(4)

console.log(result)

or lodash equivalents:

const searchParentId = searchParentId =>
  _.filter(terms, ({ parentIds }) => _.includes(parentIds, searchParentId))

const terms = [{"id":13,"name":"illustrator","parentIds":[2,4],"isCompanyArea":false},{"id":14,"name":"figma","parentIds":[2,3],"isCompanyArea":true},{"id":15,"name":"sas","parentIds":[3,4,2],"isCompanyArea":false},{"id":16,"name":"jmp","parentIds":[3],"isCompanyArea":false},{"id":17,"name":"docker","parentIds":[4,5],"isCompanyArea":false}]

const result = searchParentId(4)

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.js"></script>

Answer 2

Why use lodash if js already offers everything you need?

const items = terms.filter(item => item.parentIds && item.parentIds.includes(myParentId));

Answer 3

You can use filter in combination with includes to filter out the entries where parentIds contains a certain id.

function filter(id) {
    return _.filter(terms, term => term.parentIds.includes(id));
}

Also, you do not need lodash:

function filter(id) {
    return terms.filter(term => term.parentIds.includes(id));
}

如何实现“ getAllChildrenById”方法

3 个答案: