Is there some elegant way of filtering out falsey properties from this object with lodash/underscore? Similar to how _.compact(array) removes falsey elements from arrays
so from
{
propA: true,
propB: true,
propC: false,
propD: true,
}
returning
{
propA: true,
propB: true,
propD: true,
}
Lodash 4.0 has _.pick, which takes an array of properties, and _.pickBy which takes a function as an argument and returns an object only containing the keys for which that function returns truthy which is what we want here, so it'd be:
filtered = _.pickBy(obj, function(value, key) {return value;})
Or, since _.pickBy defaults to using _.identity as it's second argument, (and that's essentially what we've written above,) it can just be written as:
filtered = _.pickBy(obj);
In underscore and old versions of lodash, there's just a single _.pick, which has both behaviors of _.pick and _.pickWith from v4. So you can do:
filtered = _.pick(obj, function(value, key) {return value;})
Or more succinctly:
filtered = _.pick(obj, _.identity)
