how to convert object into array of objects (or collection of objects)

Question

Searched and searched, can't find this, but I'm assuming it's easy.

I'm looking for the lodash "object" equivalent of lodash _.pairs() - but I want an array of objects (or a collection of objects).

Example:

// Sample Input
{"United States":50, "China":20}

// Desired Output
[{"United States":50}, {"China":20}]

Hunan Rostomyan · Accepted Answer · 2015-12-02 02:16:40Z

6

Would something like this be sufficient? It's not lodash, but...

var input = {"United States":50, "China":20};
Object.keys(input).map(function(key) {
  var ret = {};
  ret[key] = input[key];
  return ret;
});
//=> [{"United States":50}, {"China":20}]

edited Dec 2, 2015 at 2:16

answered Dec 2, 2015 at 1:48

Hunan Rostomyan

2,1762 gold badges22 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

random_user_name Over a year ago

Nice solution. I'm going to wait and see if a lodash option comes up - this project is fairly committed to using lodash if possible.

mkoryak Over a year ago

lodash is helper lib, you dont need to use it if your language natively supports the thing you are trying to do :P

Hunan Rostomyan Over a year ago

@cale_b All javascript is lodash, but trivially, of course.

random_user_name Over a year ago

@mkoryak - Understood. But, if I have lodash loaded, and I can complete this in a single function line such as _.pairs(), and use it in my _.chain(), then using the lodash method makes far more sense than for me to write this function and call it separately. Are you suggesting it's not available in lodash?

Hunan Rostomyan Over a year ago

@cale_b Vohuman has provided exactly the solution you were looking for!

Ram · Accepted Answer · 2015-12-02 02:34:50Z

5

Using lodash, this is one way of generating the expected result:

var res = _.map(obj, _.rearg(_.pick, [2,1]));

The above short code snippet can be confusing. Without using the _.rearg function it becomes:

_.map(obj, function(v, k, a) { return _.pick(a, k); });

Basically the rearg function was used for reordering the passed arguments to the pick method.

edited Dec 2, 2015 at 2:34

answered Dec 2, 2015 at 2:16

Ram

145k16 gold badges174 silver badges201 bronze badges

4 Comments

mkoryak Over a year ago

this is the correct answer to this question, but if you use this in my code base without a 10 line comment, I will kick you. I can look at @HunanRostomyan's code and tell you exactly what it does without much thought

random_user_name Over a year ago

@mkoryak - indeed, lots of lodash function chains require comments, otherwise it's virtually nonsensical! (I'm finding this to be true of Angular also).

Andy Over a year ago

@cale_b, to use the code in chain you need to add it as a mixin.

random_user_name Over a year ago

@andy - I was able to make it work in a chain without mixin - _.chain(data).map(function(v,k,a) {return _.pick(a,k);});

mkoryak · Accepted Answer · 2015-12-02 02:10:31Z

1

ok, if you must:

var input = {"United States":50, "China":20};
var ouput = _.map(input, function(val, key){ var o = {}; o[key] = val; return o; });

but this is not better than the previous answer. its worse.

answered Dec 2, 2015 at 2:10

mkoryak

58.1k64 gold badges204 silver badges262 bronze badges

3 Comments

random_user_name Over a year ago

You are right, it's not better. While I know I could use _.map to do about anything, what I'm asking is if there's a version equivalent to _.pairs() that I'm missing....

random_user_name Over a year ago

Thanks for the help on this one!

neversaint Over a year ago

@mkoryak: care to check qtip question? stackoverflow.com/questions/34125268/…

Collectives™ on Stack Overflow

how to convert object into array of objects (or collection of objects)

3 Answers 3

5 Comments

4 Comments

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

5 Comments

4 Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related