snakes_are_bad, camelsAreBetter Introduction
All these snakes everywhere! I've had enough, and have decided that I much prefer camels. Therefore, I want you to convert my snakes to camels for me.
Challenge
Turn any snake_case string into a camelCase string. 
Capitals should be returned to lowercase before the conversion occurs.
Test Cases
In: camel_case 
Out: camelCase
In: curse_these_snakes 
Out: curseTheseSnakes
In: i_promise_1234_is_not_my_password 
Out: iPromise1234IsNotMyPassword
In: AAAAA_BBBBB 
Out: aaaaaBbbbb
Rules
As per usual, standard loophole rules apply. 
This is code-golf - shortest answer wins.
Leading/trailing underscores (e.g _string_) are ignored.
Current Winners (subject to change)
Esoteric Language
Me, with -1 bytes.
Standard Language
Also me, with -2 bytes.
Python 3, 51 bytes



lambda s:s[0].lower()+s.title().replace('_','')[1:]


Try it online!

-4 bytes thanks to ReinstateMonica