J has the verbs behead[0] (for xs[1:]) and curtail[1] (for xs[:-1]), so the J oneliner for the above code would be <./ ([&}. - }:) xs [0] https://code.js

J has the verbs behead[0] (for xs[1:]) and curtail[1] (for xs[:-1]), so the J oneliner for the above code would be <./ ([&}. - }:) xs [0] https://code.jsoftware.com/wiki/Vocabulary/curlyrtdot https://code.jsoftware.com/wiki/Vocabulary/curlyrtdot [1] https://code.jsoftware.com/wiki/Vocabulary/curlyrtco https://code.jsoftware.com/wiki/Vocabulary/curlyrtco