javascript - 使用 lodash 下划线比较重复电子邮件列表

Question

我会尝试解释我需要做什么，为什么解释起来没那么简单。

我有4个电子邮件列表，其中有重复的项目，需要提取这些电子邮件，例如:

list 1:
email1, email2, email4, email5

list 2:
email2, email3, email5, email6

list 3:
email1, email2, email7, email8

list 4:
email2, email4, email6, email7

我需要这个: 结果:

email1 (list1, list3)
email2 (list1, list2, list3, list4)
email3 (list2)

...

我正在尝试使用 JavaScript 来完成此操作，因为实际上这些电子邮件位于 Excel 中..

JSbin: http://jsbin.com/zerexuviya/edit?html,js,console,output

Answer 1

这是我刚刚仅使用 Underscore.js 编写的解决方案:https://jsfiddle.net/alienpavlov/b0zaz5Lw/

var all = {
    "list1": [
        "email1",
        "email2",
        "email3",
        "email4",
        "email5",
        "email6"
    ],
    "list2": [
        "email2",
        "email3",
        "email6",
        "email7"
    ],
    "list3": [
        "email1",
        "email3",
        "email4",
        "email5",
        "email6"
    ],
    "list4": [
        "email1",
        "email3",
        "email5",
        "email6"
    ]
};

var listOfAllEmails = _.union.apply(undefined, _.values(all));
_.each(listOfAllEmails, function(email, i) {
    var result = [];
    _.each(all, function(list, j) {
        if (_.indexOf(list, email) > -1) {
            result.push(j);
        }
    });
    if (result.length > 1) {
        //console.log(email, "=>", result);
        var div = document.getElementById("result")
        div.innerHTML = div.innerHTML + email + " (" + result + ")<br>";
    }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
<div id="result"></div>

这都是关于数组排序的。如果您有任何疑问，请随时在评论中提问。