Question

我有一个课程对象，我想通过检查它的类数组是否具有空位置来过滤它。但是，如果classes数组至少有一个没有null位置的对象，那么应该返回它。这是我正在研究的一个示例对象：

    courses: [
    {
        title: "Introduction to English 101",
        classes: [{
            location: null,
            endDate: "2016-03-25T22:00:00.000Z",
            startDate: "2016-03-23T22:00:00.000Z",
        }]
    },
    {
        title: "Introduction to Japanese 101",
        classes: [{
            location: {
                city: "Paris",
            },
            endDate: "2016-03-25T22:00:00.000Z",
            startDate: "2016-03-23T22:00:00.000Z",
        }]
    }, 
    {
        title: "Introduction to Spanish 101",
        classes: [{
            location: null,
            startDate: "2016-02-23T10:11:35.786Z",
            endDate: "2016-02-23T12:11:35.786Z",
        }, 
        {
            location: {
                city: "Montreal",
            },            
            startDate: "2016-04-01T10:11:35.786Z",
            endDate: "2016-04-15T10:11:35.786Z",
        }],
    }
]

这是我期望获得的结果：

    courses: [
    {
        title: "Introduction to Japanese 101",
        classes: [{
            location: {
                city: "Paris",
            },
            endDate: "2016-03-25T22:00:00.000Z",
            startDate: "2016-03-23T22:00:00.000Z",
        }]
    }, 
    {
        title: "Introduction to Spanish 101",
        classes: [{
            location: null,
            startDate: "2016-02-23T10:11:35.786Z",
            endDate: "2016-02-23T12:11:35.786Z",
        }, 
        {
            location: {
                city: "Montreal",
            },            
            startDate: "2016-04-01T10:11:35.786Z",
            endDate: "2016-04-15T10:11:35.786Z",
        }],
    }
]

由于对象的嵌套结构，我无法理解如何过滤这个问题。任何帮助将不胜感激！

Answer 1

使用 _.filter 和 _.every 的组合如何：

_.filter(obj.courses, function(o) {
  return !_.every(o.classes,{ location: null });
});

https://jsfiddle.net/W4QfJ/1534/

Answer 2

这个怎么样：

var data = { courses: [/* your sample data above */] };

var result = data.courses.filter(function(course){  
    return course.classes && course.classes.some(function(course){
       return course && course.location !== null;
   });
});

https://jsfiddle.net/oobxt82n/

lodash过滤掉具有空值的对象

2 个答案: