Node.js中如何合并两个复杂对象的介绍
程序员文章站
2022-03-18 20:32:51
...
下面这篇文章主要给大家介绍了在Node.js中如何合并两个复杂对象的方法,文中给出了详细的示例代码,相信对大家的理解和学习具有一定的参考借鉴价值,有需要的朋友可以参考,下面来一起看看吧。
前言
相信大家都知道在通常情况下,在Node.js中我们可以通过underscore的extend或者lodash的merge来合并两个对象,但是对于像下面这种复杂的对象,要如何来应对呢?下面来一起学习学习吧。
Node.js合并两个复杂对象
例如我有以下两个object:
var obj1 = { "name" : "myname", "status" : 0, "profile": { "sex":"m", "isactive" : true}, "strarr":["one", "three"], "objarray": [ { "id": 1, "email": "a1@me.com", "isactive":true }, { "id": 2, "email": "a2@me.com", "isactive":false } ] }; var obj2 = { "name" : "myname", "status" : 1, "newfield": 1, "profile": { "isactive" : false, "city": "new York"}, "strarr":["two"], "objarray": [ { "id": 1, "isactive":false }, { "id": 2, "email": "a2modified@me.com" }, { "id": 3, "email": "a3new@me.com", "isactive" : true } ] };
希望合并之后的结果输出成下面这样:
{ name: 'myname', status: 1, profile: { sex: 'm', isactive: false, city: 'new York' }, strarr: [ 'one', 'three', 'two' ], objarray: [ { id: 1, email: 'a1@me.com', isactive: false }, { id: 2, email: 'a2modified@me.com', isactive: false }, { id: 3, email: 'a3new@me.com', isactive: true } ], newfield: 1 }
通过underscore或者lodash现有的方法我们无法实现上述结果,那只能自己写代码来实现了。
function mergeObjs(def, obj) { if (!obj) { return def; } else if (!def) { return obj; } for (var i in obj) { // if its an object if (obj[i] != null && obj[i].constructor == Object) { def[i] = mergeObjs(def[i], obj[i]); } // if its an array, simple values need to be joined. Object values need to be remerged. else if(obj[i] != null && (obj[i] instanceof Array) && obj[i].length > 0) { // test to see if the first element is an object or not so we know the type of array we're dealing with. if(obj[i][0].constructor == Object) { var newobjs = []; // create an index of all the existing object IDs for quick access. There is no way to know how many items will be in the arrays. var objids = {} for(var x= 0, l= def[i].length ; x < l; x++ ) { objids[def[i][x].id] = x; } // now walk through the objects in the new array // if the ID exists, then merge the objects. // if the ID does not exist, push to the end of the def array for(var x= 0, l= obj[i].length; x < l; x++) { var newobj = obj[i][x]; if(objids[newobj.id] !== undefined) { def[i][x] = mergeObjs(def[i][x],newobj); } else { newobjs.push(newobj); } } for(var x= 0, l = newobjs.length; x<l; x++) { def[i].push(newobjs[x]); } } else { for(var x=0; x < obj[i].length; x++) { var idxObj = obj[i][x]; if(def[i].indexOf(idxObj) === -1) { def[i].push(idxObj); } } } } else { def[i] = obj[i]; } } return def;}
将上述代码稍作改进,我们可以实现在合并过程中将Number类型的值自动相加。
function merge(def, obj) { if (!obj) { return def; } else if (!def) { return obj; } for (var i in obj) { // if its an object if (obj[i] != null && obj[i].constructor == Object) { def[i] = merge(def[i], obj[i]); } // if its an array, simple values need to be joined. Object values need to be re-merged. else if(obj[i] != null && (obj[i] instanceof Array) && obj[i].length > 0) { // test to see if the first element is an object or not so we know the type of array we're dealing with. if(obj[i][0].constructor == Object) { var newobjs = []; // create an index of all the existing object IDs for quick access. There is no way to know how many items will be in the arrays. var objids = {} for(var x= 0, l= def[i].length ; x < l; x++ ) { objids[def[i][x].id] = x; } // now walk through the objects in the new array // if the ID exists, then merge the objects. // if the ID does not exist, push to the end of the def array for(var x= 0, l= obj[i].length; x < l; x++) { var newobj = obj[i][x]; if(objids[newobj.id] !== undefined) { def[i][x] = merge(def[i][x],newobj); } else { newobjs.push(newobj); } } for(var x= 0, l = newobjs.length; x<l; x++) { def[i].push(newobjs[x]); } } else { for(var x=0; x < obj[i].length; x++) { var idxObj = obj[i][x]; if(def[i].indexOf(idxObj) === -1) { def[i].push(idxObj); } } } } else { if (isNaN(obj[i]) || i.indexOf('_key') > -1){ def[i] = obj[i]; } else{ def[i] += obj[i]; } } } return def; }
例如有以下两个对象:
var data1 = { "_id" : "577327c544bd90be508b46cc", "channelId_info" : [ { "channelId_key" : "0", "secondLevel_group" : [ { "secondLevel_key" : "568cc36c44bd90625a045c60", "sender_group" : [ { "sender_key" : "577327c544bd90be508b46cd", "sender_sum" : 40.0 } ], "senders_sum" : 40.0 } ], "channelId_sum" : 40.0 } ], "car_sum" : 40.0 }; var data2 = { "_id" : "577327c544bd90be508b46cc", "channelId_info" : [ { "channelId_key" : "0", "secondLevel_group" : [ { "secondLevel_key" : "568cc36c44bd90625a045c60", "sender_group" : [ { "sender_key" : "577327c544bd90be508b46cd", "sender_sum" : 20.0 }, { "sender_key" : "5710bcc7e66620fd4bc0914f", "sender_sum" : 5.0 } ], "senders_sum" : 25.0 }, { "secondLevel_key" : "55fbeb4744bd9090708b4567", "sender_group" : [ { "sender_key" : "5670f993a2f5dbf12e73b763", "sender_sum" : 10.0 } ], "senders_sum" : 10.0 } ], "channelId_sum" : 35.0 }, { "channelId_key" : "1", "secondLevel_group" : [ { "secondLevel_key" : "568cc36c44bd90625a045c60", "sender_group" : [ { "sender_key" : "577327c544bd90be508b46cd", "sender_sum" : 20.0 } ], "senders_sum" : 20.0 } ], "channelId_sum" : 20.0 } ], "car_sum" : 55.0 };
合并之后的结果如下:
{ "_id": "577327c544bd90be508b46cc", "channelId_info": [ { "channelId_key": "0", "secondLevel_group": [ { "secondLevel_key": "568cc36c44bd90625a045c60", "sender_group": [ { "sender_key": "577327c544bd90be508b46cd", "sender_sum": 60 }, { "sender_key": "5710bcc7e66620fd4bc0914f", "sender_sum": 5 } ], "senders_sum": 65 }, { "secondLevel_key": "55fbeb4744bd9090708b4567", "sender_group": [ { "sender_key": "5670f993a2f5dbf12e73b763", "sender_sum": 10 } ], "senders_sum": 10 } ], "channelId_sum": 75 }, { "channelId_key": "1", "secondLevel_group": [ { "secondLevel_key": "568cc36c44bd90625a045c60", "sender_group": [ { "sender_key": "577327c544bd90be508b46cd", "sender_sum": 20 } ], "senders_sum": 20 } ], "channelId_sum": 20 } ], "car_sum": 95 }
以上就是本文的全部内容,希望对大家的学习有所帮助,更多相关内容请关注PHP中文网!
相关推荐:
Node.js中Request模块处理HTTP协议请求的使用介绍
以上就是Node.js中如何合并两个复杂对象的介绍的详细内容,更多请关注其它相关文章!
推荐阅读
-
Node.js中如何合并两个复杂对象详解
-
Servlet映射、Servlet中的两个init()方法、Servlet中的config对象介绍
-
如何在Linux系统中利用node.js提取Word及PDF文本内容的案例介绍
-
Node.js中如何合并两个复杂对象详解
-
python如何快速的查找出两个电子表中数据的差异的方法介绍
-
Servlet映射、Servlet中的两个init()方法、Servlet中的config对象介绍
-
Node.js中如何合并对象具体用法代码实例详解
-
Node.js中全局对象的详细介绍
-
Python中如何优雅的合并两个字典(dict)
-
python如何快速的查找出两个电子表中数据的差异的方法介绍