How to use lodash to grab arrays from objects inside larger array?

Question

Here is what my tickerTagObject array looks like:

It's an array of objects, each object contains another object + 1 array

enter image description here

I'm able to grab the tickers using this syntax below:

var tickerObjs = _(tickerTagObjs)
    .filter(function(tiks) { return tiks; })
    .pluck('ticker')
    .value();

console.log(tickerObjs);

^ This gives me an array of the ticker objects

However using the same for the tags doesn't work, perhaps because the tags are an Array not an Object?

var tagObjs = _(tickerTagObjs.tags)
    .filter(function(tags) { return tags; })
    .pluck('tags')
    .value();

console.log(tagObjs);

enter image description here

How would you use lodash to "pluck" the tag objects inside the array tags inside each TagsObject?

Ram · Accepted Answer · 2015-05-22 16:01:28Z

2

That's because in the second snippet you are passing direct, undefined tags property of array to the lodash constructor and subsequent operations effectively do not do anything.

Also note that filter calls in your snippets are redundant and you can simply remove them.

You could also use the native Array map method:

var tags = tickerTagObjs.map(function(el) { return el.tags; });

edited May 22, 2015 at 16:01

answered May 22, 2015 at 15:58

Ram

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6 Comments

Leon Gaban Over a year ago

Ah thanks that was it! Hmm I'm getting tags now, but it's inside an Array which is inside an Array... oh well on to the next prob! 9 more mins :D

Ram Over a year ago

@LeonGaban You are welcome! Yes, it should return an array of arrays.

Leon Gaban Over a year ago

Is there a way to easily avoid that? I mean I can just do tags[0] but rather it just be tags

Ram Over a year ago

@LeonGaban Well, no there isn't. There are several values and that's why array exists. If you need the first value of the array you can use lodash first method.

Ram Over a year ago

@LeonGaban Yeah, Lodash is awesome because JavaScript is awesome!

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