如何使用 lodash 过滤器在列表中查找不具有特定属性的对象

Question

我有一个看起来像这样的数组

{
  "id": "1",
  "name": "Test 1",
  "age": 23
},
{
  "id": "2",
  "name": "Test 2",
  "age": 62
},
{
  "id": "3",
  "name": "Test 3"
}

使用 lodash 过滤器，如何过滤未定义年龄的对象？如最后一个名为“Test 3”的项目

Answer 1

您可以使用_.filter() 删除项目，使用_.has() 检测它们是否具有age 属性：

const arr = [{"id":"1","name":"Test 1","age":23},{"id":"2","name":"Test 2","age":62},{"id":"3","name":"Test 3"}]

const result = _.filter(arr, o => _.has(o, 'age'))

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.js"></script>

或者使用lodash/fp生成函数：

const fn = _.filter(_.has('age'))

const arr = [{"id":"1","name":"Test 1","age":23},{"id":"2","name":"Test 2","age":62},{"id":"3","name":"Test 3"}]

const result = fn(arr)

console.log(result)

<script src='https://cdn.jsdelivr.net/g/lodash@4(lodash.min.js+lodash.fp.min.js)'></script>