Perguntas de entrevista de vagas de Software Developer Co-Op da empresa D2L

Past co-op experiences + front-end coding exercise.

i don't exactly remember but it was something about an array of arrays where each sub-array contains an arbitrary number of random strings, find the strings that occur in every sub-array and return them (the returned result strings must also be in an array). There can be duplicates of the same string in any of the sub-arrays.