collections - 如何使用 underscore.js/lodash.js 遍历集合

Question

小问题。我有收藏

var allnames = {
    'names': 
     [
         { 'name': [ {'surname': 'moe'}, {'nickname': 'moose' } ] },
         { 'name': [ {'surname':'larry'}, {'nickname': 'lark' } ] }
     ]
};

并且想要访问/获取每个'surname'和'nickname'.

我尝试了不同的选择，但没有任何运气（例如_.each/ _.map）。

有没有人有这方面的经验？

Answer 1

这个片段将把你在那里的结构变成更容易使用的东西：

 var names = _.map( allnames.names, function(n){
    // n is an array with each object having one property; either a surname or a nickname
    return _.reduce(n.name, function(memo,part){ return _.extend(memo,part); }, {})
 });

这里的名称将是一个对象数组，每个对象都有一个姓氏和一个昵称：

[ { surname: 'moe', nickname: 'moose' }, { surname: 'larry', nickname: 'lark' } ]

一旦你有了这个结构，就很容易操纵该数组来提取你想要的东西，例如获取所有姓氏：

var surnames = _.pluck(names, 'surname');
var nicknames = _.pluck(names, 'nickname');

Answer 2

I eventually found a solution, which covers what I was striving at

var allnames = {
    'names': 
     [
        { 'name': [ {'surname': 'moe'}, {'nickname': 'moose' } ] },
        { 'name': [ {'surname': 'larry'}, {'nickname': 'lark' } ] }
     ]
};

var surnames = [];
var nicknames = [];

function nameproc(myobj) 
{ 
    if ( myobj.surname ) 
    {
        surnames.push(myobj.surname);
        return myobj.surname
    }
    if( myobj.nickname) 
    {
        nicknames.push(myobj.nickname);
        return myobj.nickname;
    }
}

_.each(allnames.names, function(myobj) 
{ 
    _.each(myobj, function(nameobj) 
    {
        var nameobj = _.each(nameobj,nameproc);
    });
});

// Print out the surnames and nicknames

console.log(surnames);
console.log(nicknames);