This question as a JS-only answer here. But simply because I'd like to become more proficient with Lodash, I'm looking for the Lodash solution.
Let's say I have an array that looks like:
[[a, b, c], [d, e, f], [h, i, j]]
I'd like to get the first element of each array as its own array:
[a, d, h]
What is the most efficient way to do this with Lodash? Thanks.
You could use _.map
with _.head
for the first element.
var data = [['a', 'b', 'c'], ['d', 'e', 'f'], ['h', 'i', 'j']],
result = _.map(data, _.head);
console.log(result);
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>
Or just the key.
var data = [['a', 'b', 'c'], ['d', 'e', 'f'], ['h', 'i', 'j']],
result = _.map(data, 0);
console.log(result);
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>