an class='fu'>to_snake_case</span>(<span class='no'>strings</span>)</div><div class='output co'>#&gt; [1] "this_is_a_strange_string" "and_this_another_one"    
#&gt; [3] NA                        </div><div class='input'><span class='fu'>to_lower_camel_case</span>(<span class='no'>strings</span>)</div><div class='output co'>#&gt; [1] "thisIsAStrangeString" "andThisAnotherOne"    NA                    </div><div class='input'><span class='fu'>to_upper_camel_case</span>(<span class='no'>strings</span>)</div><