lodash過濾掉具有空值的對象

Question

我有一個課程對象，我想通過檢查它的類數組是否具有空位置來過濾它。 但是，如果classes數組至少有一個沒有null位置的對象，那么應該返回它。 這是我正在研究的一個示例對象：

    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",
        }],
    }
]

這是我期望獲得的結果：

    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",
        }],
    }
]

由於對象的嵌套結構，我無法理解如何過濾這個問題。 任何幫助將不勝感激！

Answer 1

如何使用_.filter和_.every的組合：

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

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

Answer 2

這個怎么樣：

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/