javascript 使用 lodash/underscore.js 从数组中获取对象属性和值

Get object properties and values from array using lodash/underscore.js

提问by RedGiant

Fiddle Example

小提琴示例

I have an array like this:

我有一个这样的数组：

var array = [ { 
    'data-price': '0.00',
    'data-term': '532',
    'data-model_id': '409',
  },
  { 
    'data-price': '0.00',
    'data-term': '483',
    'data-model_id': '384',
  },
  { text: 'dffdfddgfdgf' } ];

I want to filter out the last object and extract [{data-model_id:409},{data-model_id:384}]from the first two objects. I have tried this code:

我想过滤掉最后一个对象并[{data-model_id:409},{data-model_id:384}]从前两个对象中提取。我试过这个代码：

 var k = _(array).filter('data-model_id').pluck('data-model_id').value();
console.log(k);

and it returns an array of the values only, ["409", "384"]. Is there a function to return the whole objects in lodash or underscore?

它只返回一个值数组，["409", "384"]。是否有一个函数可以在 lodash 或下划线中返回整个对象？

回答by pawel

Using plain JS to show the logic: you need to filterout the elements that don't have the key, then mapthe new collection to another form:

使用纯JS来展示逻辑：你需要把filter没有key的元素取出来，然后map新的集合到另一种形式：

array.filter( function(item){
    return 'data-model_id' in item;
  }).map( function( item ){
    return { 'data-model_id' : item['data-model_id'] }
  });

http://jsfiddle.net/dn4tn6xv/7/

http://jsfiddle.net/dn4tn6xv/7/

回答by Amit Joki

What if I told you this is possible using just native javascript? Just use Array.filterand Object.keys, using the former to filter and the latter to get the keys and then returning a Booleanby comparing the index of the Arrayreturned by Object.keys

如果我告诉您仅使用本机 javascript 就可以做到这一点呢？只要使用Array.filter和Object.keys，使用前进行筛选，后者拿到钥匙，然后返回一个Boolean通过比较的指标Array由归国Object.keys

var k = array.filter(function(obj){
   return Object.keys(obj).indexOf("data-model_id") > -1;
});

回答by Alexander T.

In lodashyou can do like this:

在lodash你可以这样做：

get full object

获取完整对象

console.log(_.filter(array, 'data-model_id'));

get only data-model_idproperty

只得到data-model_id财产

var res = _.chain(array).filter('data-model_id').map(function (el) {
  return _.pick(el, 'data-model_id');
}).value();

Example

例子