在我的函数中以下划线过滤掉数组？

Question

如果profile.team_member_designations是一个数组，则运行以下代码。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，我不希望代码运行。基本上，就在map函数之前，我想过滤掉数组只运行代码。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

如果我理解你的问题，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;
};

Answer 2

如果条件如下，则替换如下：

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

Answer 3

<强>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;
    };

当参数是数组时，Array.isArray返回true。它也很好browser support。