如果键与underscore.js匹配，则比较两个数组 [英] compare two arrays if keys match with underscore.js

问题描述

我有一个拥有Facebook权限的数组以及用户应该给出的权限数组：

I have an array with permissions from Facebook and an array of the permissions that the user shouldve given:

window.FB.api('/me/permissions', function(perm){                     
    if(perm){
       var given_permissions =  _.keys(perm['data'][0];
       var needed_permissions = ["publish_stream", "email"];
       //now check if given permissions contains needed permissions
    }
}

现在我要比较所有 needed_permissions 是否在 given_permissions ，以下划线的方式（没有自己循环两个数组并比较值）。我看到了 _ .include 方法，但这会将数组与值进行比较。如果所有权限都可用，我想返回true，否则返回false。如果可能，我正在寻找一个不错的单行调用。

Now I want to compare if all the needed_permissions are in given_permissions, in an underscore savvy way (without looping two arrays myself and compare values). I saw a _.include method, but this compares an array with a value. I want to return true if all the permissions are available and else a false. I was looking for a nice single line call if possible.

原因是， FB.login 即使用户选择可以，也会返回true cel扩展权限。所以我需要再次检查这个。

The reason for this is, that FB.login returns true even if the user chooses to cancel the extended permissions. So I need to doublecheck this.

推荐答案

这个怎么样？

_.all(needed_permissions, function(v){
    return _.include(given_permissions, v);
});

这篇关于如果键与underscore.js匹配，则比较两个数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！