描述

得到多个数组的交集 v3.0.9+

1.示例

import { intersection } from 'sf-utils2'

const a1 = [
 { empId: 1, empName: '蔡徐坤' },
 { empId: 2, empName: '小明' }，
 { empId: 3, empName: '小红' }，
]

const a2 = [
 { empId: 1, empName: '蔡徐坤' },
 { empId: 4, empName: '小明4' }，
 { empId: 5, empName: '小红5' }，
]

// 根据属性名转化
intersection([a1, a2], 'empId')
// 输出
[{empId: 1, empName: '蔡徐坤'}]

// 不传属性名
const a1 = [1, 2, 3, '4']
const a2 = [1, 2, 4, 5]
intersection([a1, a2])
// 输出
[1, 2]


intersection(
  [
     [1, 2, '3', 4],
     [1, 2, 3, '4', [1, '4']],
     [1, 2, '4']
  ]
)
=>
[1, 2]

2.入参说明

参数	说明	类型	是否必填
val	值	Array	--------

3.源码

源码，点开查看 👈

import arrayToMap from '@/array/arrayToMap'
import uniq from '@/array/uniq'
import isPrimitive from '@/base/isPrimitive'

/**
 * 获取多个数组的交集
 * @param {Array[]} array
 * @param {String|unknown} property
 * @return {[string, any]|*[]}
 */
function intersection(array, property) {
  const arrayFlatten = array.flat(1) || []
  console.log('array', arrayFlatten)
  const arrayMap$property = arrayToMap(arrayFlatten, property, { valueType: 'array' })
  const [array$0] = arrayFlatten
  const result = []
  arrayMap$property.forEach((v, k) => {
    if (v?.length === array.length) {
      result.push(...v)
    }
  })
  if (isPrimitive(array$0)) {
    return uniq(result)
  }
  return result
}

export default intersection