javascript - 动态分组或过滤数组中共享给定属性名称和值的对象

标签 javascript arrays

我想迭代数组循环并根据数组中对象的属性名称和值执行操作。

array 是从一个非常“扁平”的 JSON 文件中检索的，该文件是来自多个 的 git 提交日志的集合git 存储库(从 bash 通过 this project 解析为 JSON)。

我想做的一些事情是:

  • 按时间戳对提交进行排序。
  • 按存储库过滤它们，然后对数据进行处理。
  • 按author_email过滤它们，然后对数据进行处理。
  • 递归计算对每个存储库的影响。

但我最感兴趣的是如何选择/分组/过滤共享特定属性值的所有提交(例如repository或author_email或date_day_week)而不指定任何明确的值？

我已经手动完成了(请参见下面代码块中从下到上的第 7 行):

// == request and parse JSON data == //
// define data source
var data_source = "src/json/data.json";
// request the data
var xhr = new XMLHttpRequest();
xhr.open("GET", data_source);
xhr.onreadystatechange = function () {
    if (this.readyState !== 4) { return; }
    if ((this.status >= 200 && this.status < 300) || this.status === 0) {
        // get raw data
        data_JSON = this.responseText;
        // parse JSON data to JavaScript format
        data_parsed = JSON.parse(data_JSON);
        // manipulate data 'outside' the xhr request to keep things tidy
        manipulateData(data_parsed);
    } else {
        console.log('There was an error completing the XMLHttpRequest...');
    }
};
xhr.send();

// create a callback function to do stuff 'outside' xhr
function manipulateData(object){
    // define root object
    var commit = object.commits;
    // loop through every item so that we can iterate with them
    for (var i = 0; i < commit.length; i++){
        // define 'commit[i]' as 'item' so that code is more legible
        var item = commit[i];
        // list property names and their values on console
        for (var key in item) {
            if (item.hasOwnProperty(key)) {
                // list only items under 'lemon' repository <-- this is where I need it to be generic so I can group/filter all items under a common repository and do things with it
                if (item.repository == 'lemon') {
                    console.log(key + " -> " + item[key]);
                }
            }
        }
    }
}

但是我想做的是对共享给定属性值的所有提交进行分组/过滤(即存储库柠檬，苹果，橙色等)动态地结合在一起。一旦我知道如何做到这一点，我希望能够对可能共享属性值的其他属性名称执行相同的操作，例如 author_email、date_day_week、 date_month_name、插入等

下面是原始的 data.json 文件，在 var data_source = "src/json/data.json"; 处声明为变量:

{
    "commits":[
        {
            "repository":"lemon",
            "commit_nr":"1",
            "commit_hash":"146b76e91a269a9c06dcc4eb6854f76a7900a08e",
            "commit_hash_abbreviated":"146b76e",
            "tree_hash":"4090f728f1759a16df7dde49bf86f7536354ae02",
            "tree_hash_abbreviated":"4090f72",
            "parent_hashes":"",
            "parent_hashes_abbreviated":"",
            "author_email":"bogus@name.com",
            "date_day_week":"Fri",
            "date_month_name":"Feb",
            "date_month_day":"25",
            "date_hour":"09:59:17",
            "date_year":"2011",
            "date_hour_gmt":"-0800",
            "author_date_unix_timestamp":"1298656757",
            "date_iso_8601":"2011-02-25",
            "committer_email":"bogus@name.com",
            "files_changed":"46",
            "insertions":"3162",
            "deletions":"",
            "impact":"3162"
        },
        {
            "repository":"lemon",
            "commit_nr":"2",
            "commit_hash":"d6c8de134e0ee33b3837795250c9fffa02e57738",
            "commit_hash_abbreviated":"d6c8de1",
            "tree_hash":"f4ec855ed6c4402304500a68a74ff38943a47d3d",
            "tree_hash_abbreviated":"f4ec855",
            "parent_hashes":"146b76e91a269a9c06dcc4eb6854f76a7900a08e",
            "parent_hashes_abbreviated":"146b76e",
            "author_email":"bogus@name.com",
            "date_day_week":"Fri",
            "date_month_name":"Feb",
            "date_month_day":"25",
            "date_hour":"11:27:24",
            "date_year":"2011",
            "date_hour_gmt":"-0800",
            "author_date_unix_timestamp":"1298662044",
            "date_iso_8601":"2011-02-25",
            "committer_email":"bogus@name.com",
            "files_changed":"5",
            "insertions":"46",
            "deletions":"40",
            "impact":"6"
        },
        {
            "repository":"lemon",
            "commit_nr":"3",
            "commit_hash":"9a27e12968397923df17a424672447eee06ea248",
            "commit_hash_abbreviated":"9a27e12",
            "tree_hash":"5ceb1539ee9879f7d9043123ee36c4c44c93e64c",
            "tree_hash_abbreviated":"5ceb153",
            "parent_hashes":"d6c8de134e0ee33b3837795250c9fffa02e57738",
            "parent_hashes_abbreviated":"d6c8de1",
            "author_email":"bogus@name.com",
            "date_day_week":"Fri",
            "date_month_name":"Feb",
            "date_month_day":"25",
            "date_hour":"11:52:09",
            "date_year":"2011",
            "date_hour_gmt":"-0800",
            "author_date_unix_timestamp":"1298663529",
            "date_iso_8601":"2011-02-25",
            "committer_email":"bogus@name.com",
            "files_changed":"6",
            "insertions":"151",
            "deletions":"81",
            "impact":"70"
        },
        {
            "repository":"apple",
            "commit_nr":"1",
            "commit_hash":"61180570cb0cbc2233f841436d924ab43eeb7c7e",
            "commit_hash_abbreviated":"6118057",
            "tree_hash":"f652101ca189f92fc70767203879af9aeb9cec1e",
            "tree_hash_abbreviated":"f652101",
            "parent_hashes":"",
            "parent_hashes_abbreviated":"",
            "author_email":"bogus@name.com",
            "date_day_week":"Fri",
            "date_month_name":"Oct",
            "date_month_day":"1",
            "date_hour":"17:01:48",
            "date_year":"2010",
            "date_hour_gmt":"+0700",
            "author_date_unix_timestamp":"1285927308",
            "date_iso_8601":"2010-10-01",
            "committer_email":"bogus@name.com",
            "files_changed":"0",
            "insertions":"",
            "deletions":"",
            "impact":"0"
        },
        {
            "repository":"apple",
            "commit_nr":"2",
            "commit_hash":"3d3d52f0197aa501c9c4d6e4c245604e696097e1",
            "commit_hash_abbreviated":"3d3d52f",
            "tree_hash":"a1e190dfc9e63c7895884fbc9c1cbfa1473a27c2",
            "tree_hash_abbreviated":"a1e190d",
            "parent_hashes":"61180570cb0cbc2233f841436d924ab43eeb7c7e",
            "parent_hashes_abbreviated":"6118057",
            "author_email":"bogus@name.com",
            "date_day_week":"Mon",
            "date_month_name":"Oct",
            "date_month_day":"11",
            "date_hour":"11:30:08",
            "date_year":"2010",
            "date_hour_gmt":"+0700",
            "author_date_unix_timestamp":"1286771408",
            "date_iso_8601":"2010-10-11",
            "committer_email":"bogus@name.com",
            "files_changed":"24",
            "insertions":"452",
            "deletions":"",
            "impact":"452"
        },
        {
            "repository":"apple",
            "commit_nr":"3",
            "commit_hash":"1b5b80db7dd8a252d40b6331ba7ba85dd4af90c6",
            "commit_hash_abbreviated":"1b5b80d",
            "tree_hash":"89d70a6ac4b071aea13055f91a9907c6480e99d3",
            "tree_hash_abbreviated":"89d70a6",
            "parent_hashes":"3d3d52f0197aa501c9c4d6e4c245604e696097e1",
            "parent_hashes_abbreviated":"3d3d52f",
            "author_email":"bogus@name.com",
            "date_day_week":"Mon",
            "date_month_name":"Oct",
            "date_month_day":"11",
            "date_hour":"14:17:47",
            "date_year":"2010",
            "date_hour_gmt":"+0700",
            "author_date_unix_timestamp":"1286781467",
            "date_iso_8601":"2010-10-11",
            "committer_email":"bogus@name.com",
            "files_changed":"1",
            "insertions":"15",
            "deletions":"",
            "impact":"15"
        },
        {
            "repository":"orange",
            "commit_nr":"1",
            "commit_hash":"dac34582a10de94cd305afc47cd888ee59c30e35",
            "commit_hash_abbreviated":"dac3458",
            "tree_hash":"9114b1b23157894f3fac49ecd7686aadc2cc7678",
            "tree_hash_abbreviated":"9114b1b",
            "parent_hashes":"",
            "parent_hashes_abbreviated":"",
            "author_email":"bogus@name.com",
            "date_day_week":"Tue",
            "date_month_name":"Feb",
            "date_month_day":"4",
            "date_hour":"01:24:51",
            "date_year":"2014",
            "date_hour_gmt":"-0800",
            "author_date_unix_timestamp":"1391505891",
            "date_iso_8601":"2014-02-04",
            "committer_email":"bogus@name.com",
            "files_changed":"1",
            "insertions":"4",
            "deletions":"",
            "impact":"4"
        },
        {
            "repository":"orange",
            "commit_nr":"2",
            "commit_hash":"077fa1e30bfb1b02241d8fd603941a250ded983d",
            "commit_hash_abbreviated":"077fa1e",
            "tree_hash":"d8eb6b28fd3798b0490fd7376c29781cdaffd42d",
            "tree_hash_abbreviated":"d8eb6b2",
            "parent_hashes":"dac34582a10de94cd305afc47cd888ee59c30e35",
            "parent_hashes_abbreviated":"dac3458",
            "author_email":"bogus@name.com",
            "date_day_week":"Wed",
            "date_month_name":"Feb",
            "date_month_day":"5",
            "date_hour":"20:24:48",
            "date_year":"2014",
            "date_hour_gmt":"+0700",
            "author_date_unix_timestamp":"1391606688",
            "date_iso_8601":"2014-02-05",
            "committer_email":"bogus@name.com",
            "files_changed":"9",
            "insertions":"374",
            "deletions":"",
            "impact":"374"
        },
        {
            "repository":"orange",
            "commit_nr":"3",
            "commit_hash":"e217e8d4b4e366331d5e2a196215867c60215bfc",
            "commit_hash_abbreviated":"e217e8d",
            "tree_hash":"95d4002df3db4d0f3912b0609a3680dd3d751a92",
            "tree_hash_abbreviated":"95d4002",
            "parent_hashes":"077fa1e30bfb1b02241d8fd603941a250ded983d",
            "parent_hashes_abbreviated":"077fa1e",
            "author_email":"bogus@name.com",
            "date_day_week":"Thu",
            "date_month_name":"Feb",
            "date_month_day":"6",
            "date_hour":"14:44:00",
            "date_year":"2014",
            "date_hour_gmt":"+0700",
            "author_date_unix_timestamp":"1391672640",
            "date_iso_8601":"2014-02-06",
            "committer_email":"bogus@name.com",
            "files_changed":"1",
            "insertions":"1",
            "deletions":"3",
            "impact":"-2"
        }
    ]
}

感谢任何帮助!

最佳答案

试试这个:

function groupBy(data,key, val){
    var arr=[];
    for(var i in data){
        if(data[i][key]==val) arr.push(data[i])
    }
    return arr;
}

console.log(groupBy(object.commits,"repository","lemon"))

对于不指定 val 的分组:

function groupByAuto(data, key){
    var groups={};
    for(var i in data){
        if(!groups.hasOwnProperty(data[i][key])) groups[data[i][key]]=[];
        groups[data[i][key]].push(data[i]);
    }
    return groups;
}
console.log(groupByAuto(data.commits, "repository"))

关于javascript - 动态分组或过滤数组中共享给定属性名称和值的对象，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23317037/

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