js 数组扁平化

代码

/**
 * 数组扁平化
 * @param {Array<T>} deepArr 数组
 * @param {Array<string>} hideKeys 扁平后不要的key值
 * @returns Array<T>
 */
function toFlatness(deepArr = [], hideKeys = []) {
  const reg = new RegExp(hideKeys.join('|'))
  const list = []
  function format(arr = deepArr) {
    arr.forEach(item => {
      const currentItem = { ...item } // 如果有数据代理 可以用深拷贝代替
      if (hideKeys && hideKeys.length) {
        Object.keys(item).forEach(k => {
          if (reg.test(k)) {
            delete currentItem[k]
          }
        })
      }
      list.push(currentItem)
      if (item.children) {
        format(item.children)
      }
    })
    return list
  }
  format()
  return list
}

适用数据

[{
  "value": "一级",
  "children": [
    {
      "value": "二级",
      "children": []
    },
    {
      "value": "二级-1",
      "children": []
    },
    {
      "value": "二级-2",
      "children": []
    },
    {
      "value": "二级-3",
      "children": [
        {
          "value": "三级",
          "children": [
            {
              "value": "四级",
              "children": [
                {
                  "value": "五级",
                  "children": [
                    {
                      "value": "六级",
                      "children": []
                    }
                  ]
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}]

例子

// arr 为上方举例（适用数据）
const result = toFlatness(arr, ['children'])
console.log(JSON.stringify(result, null, 2))
/*
[
  {
    "value": "一级"
  },
  {
    "value": "二级"
  },
  {
    "value": "二级-1"
  },
  {
    "value": "二级-2"
  },
  {
    "value": "二级-3"
  },
  {
    "value": "三级"
  },
  {
    "value": "四级"
  },
  {
    "value": "五级"
  },
  {
    "value": "六级"
  }
]
*/