Lodash map and return unique
56,226
Solution 1
Many ways, but uniq()
isn't a method on array, it's a lodash method.
_.uniq(_.map(data, 'usernames'))
Or:
_.chain(data).map('usernames').uniq().value()
(The second is untested and possibly wrong, but it's close.)
As mentioned in the comment, depending on what your data actually is, you could do this all in one shot without first pulling out whatever usernames
is.
Solution 2
You can also use uniqBy
function which also accepts iteratee invoked for each element in the array. It accepts two arguments as below, where id is the iteratee parameter.
_.uniqBy(array, 'id')
Author by
stackunderflow
Updated on July 24, 2020Comments
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stackunderflow almost 4 years
I have a lodash variable;
var usernames = _.map(data, 'usernames');
which produces the following;
[ "joebloggs", "joebloggs", "simongarfunkel", "chrispine", "billgates", "billgates" ]
How could I adjust the lodash statement so that it only returns an array of unique values? e.g.
var username = _.map(data, 'usernames').uniq();