用lodash或下划线进行Javascript对象转换

Question

I have an many object with structure of:

[{
     n_vId: 1,
     s_vName: 'test',
     d_date: '2016-03-15 00:00:00'
     f_a: 0,
     f_b: 0,
     f_c: 0,
     f_d: 4,
     f_e: 0,
     f_f: 0.1,
     f_g: 0
},
{
     n_vId: 2,
     s_vName: 'test',
     d_date: '2016-03-15 00:15:00'
     f_a: 1,
     f_b: 1,
     f_c: 0,
     f_d: 4,
     f_e: 0,
     f_f: 0.1,
     f_g: 0
}]

i want this object transform to

a = [
     {
         date: '2016-03-15 00:00:00',
         a: 0
     },
     {
         date: '2016-03-15 00:15:00',
         a: 1
     }
]

b = [
     {
         date: '2016-03-15 00:00:00',
         b: 0
     },
     {
         date: '2016-03-15 00:15:00',
         b: 1
     }
]
...

i can transform that. but my process is so complicated i think. so, would you advice me right process? now i use lodash but can use underscore or another js modules.

Answer 1

You can simply use map:

a = data.map(function(i) {
        return {date: i.d_date, a: i.f_a};
    });

b = data.map(function(i) {
        return {date: i.d_date, b: i.f_b};
    });

Seems simple enough to me.

Answer 2

Take a look at this npm module https://github.com/gabesoft/trans

   var trans = require('trans');
   var results = trans(data)
     .mapff('d_date', 'date')
     .mapff('f_a', 'a')
     .pick('date', 'a')
     .value();

Answer 3

As others have said, you don't need Lodash or Underscore, because this is just a map() operation, but you can use the _.map() function from those libraries if you like.

 var objs = [{ n_vId: 1, s_vName: 'test', d_date: '2016-03-15 00:00:00', f_a: 0, f_b: 0, f_c: 0, f_d: 4, f_e: 0, f_f: 0.1, f_g: 0 }, { n_vId: 2, s_vName: 'test', d_date: '2016-03-15 00:15:00', f_a: 1, f_b: 1, f_c: 0, f_d: 4, f_e: 0, f_f: 0.1, f_g: 0 }]; function transform(letter) { return _.map(objs, function (obj) { var out = { date: obj.d_date }; out[letter] = obj['f_' + letter]; return out; }); } var a = transform('a'), b = transform('b'); // etc. document.getElementById('out').textContent = JSON.stringify({a: a, b: b}, true, '\\t'); 

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