Filter object by key array

Question

I have an object that looks like this:

tagCount = {key1: val1, key2: val2...keyn:valn}

And an array that looks like this:

keys = ['key1', 'key3', 'key5'];

I want to get an object (or an array I guess) from tagCount with only the fields that match keys:

foo - {key1: val1, key3: val3, key5: val5}

I use Underscore so I feel like this is possible but for the life of me I cannot figure out the magic to make it happen.

Mike Robinet · Accepted Answer · 2014-09-27 21:15:20Z

4

I believe you want _.pick

Should be something like this: _.pick(tagCount, keys)

edited Sep 27, 2014 at 21:15

answered Sep 27, 2014 at 1:45

Mike Robinet

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3 Comments

emd Over a year ago

Not sure pick is right? It takes away the properties, not the whole record?

Mike Robinet Over a year ago

No _.pick returns a new object containing a filtered set of key-value pairs. See the _.pick documentation I linked for an example. If you only want the values, you would also need to call _.values: underscorejs.org/#values

emd Over a year ago

you are right, that's not how I read the documentation. Thanks!

brybott · Accepted Answer · 2014-09-27 01:51:44Z

0

not using underscore...

var result = [];
for (var i in keys; i<keys.length; i++){
  if (tagCount.hasOwnProperty(keys[i])){
    result.push(tagCount[keys[i]]);
  }
}
console.log(result)

I think it should work...

answered Sep 27, 2014 at 1:51

brybott

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1 Comment

emd Over a year ago

Thanks, my answer is similar.

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