在我的下划线函数中过滤掉数组？

Question

如果profile.team_member_designations 是一个数组，运行s 下面的代码。我想添加一个条件来过滤或检查 profile_member_designations 是否是一个数组，因为如果它是一个字符串，我不希望代码为运行。本质上，就在 map 函数之前，我想通过代码过滤掉仅 [=17=] 的数组。我该怎么做？

JS

   var getTeamDesignations = function(profile) {
        //Designations for a single team member                                                                                                          
        var teamDesignations = [];
        if (profile.team_members) {
            teamDesignations = _.chain(profile.team_members)
                .map(_.property('team_member_designations'))
                .flatten()
                .uniq()
                .value();
        }
        return teamDesignations;
    };

Answer 1

替换if条件如下：

if (profile.team_members && (profile.team_members instanceof Array)){

Answer 2

解决方案

使用 Array.isArray.

var getTeamDesignations = function(profile) {
        //Designations for a single team member                                                                                                          
        var teamDesignations = [];
        if (profile.team_members && Array.isArray(profile.team_members)) {
            teamDesignations = _.chain(profile.team_members)
                .map(_.property('team_member_designations'))
                .flatten()
                .uniq()
                .value();
        }
        return teamDesignations;
    };

Array.isArray returns 当参数为数组时为真。它也有很好的browser support。

Answer 3

如果我没有正确理解你的问题，你想要这样的东西。

var getTeamDesignations = function(profile) {
    //Designations for a single team member                                                                                                          
    var teamDesignations = [];
    if (profile.team_members) {
        teamDesignations = _.chain(profile.team_members)
            .filter(_.compose(_.isArray, _.property('team_member_designations')))
            .map(_.property('team_member_designations'))
            .flatten()
            .uniq()
            .value();
    }
    return teamDesignations;
};

在我的下划线函数中过滤掉数组？

Filter out for arrays in my function in underscore?

javascript

underscore.js