Filtering Object Array to only contain Key using Lodash

Question

I have the following object array:

 {
   running: false,
   swimming: false,
   drawing: true
  }

I want to filter the object array with only those that have false properties. From there I want to get only the keys of the array.

eg.

 [running, swimming]

I have the first part of removing values that have truth booleans through the following:

var filtered = _.pick(hobbies, function(value, key) {return !value;});

What would be the best way to "flatten" the current array so that I only have the key values?

JLRishe · Accepted Answer · 2016-07-25 21:45:47Z

4

The Lodash _.keys() function provides precisely what you are asking for:

var hobbies = {
    running: false,
    swimming: false,
    drawing: true
};

var filtered = _.keys(_.pick(hobbies, function(value) {return !value;}));

console.log(filtered);

// alternate approach using chain notation
var keys = _
    .chain(hobbies)
    .pick(v => !v)
    .keys();

console.log(keys);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.9.3/lodash.js"></script>

Note that in Lodash 4.x, _.pick() has changed and you should instead use _.pickBy() aboce.

edited Jul 25, 2016 at 21:45

answered Jul 25, 2016 at 21:34

JLRishe

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Comments

Morteza Tourani · Accepted Answer · 2016-07-25 21:22:28Z

3

As it is possible with pure JavaScript, then I suggesting you to do it using Object.keys and Array.prototype.filter

var obj = {
  running: false,
  swimming: false,
  drawing: true
};

var items = Object.keys(obj).filter(k => !obj[k]);
console.log(JSON.stringify(items));

answered Jul 25, 2016 at 21:22

Morteza Tourani

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