Today I am going to show you how to create a list combined with those elements from one list, that have indexes collected in the second list. For my example I will use python, because I have a little contact with it recently at my work.
def main(): x = ['a', 'b', 'c', 'd', 'e'] y = [1, 2, 3] z = [x[_] for _ in y] print(z) if __name__ == "__main__": main()
Script presented above solves exactly the issue, which was presented in the topic. You may ask, what underscore (‘_’) sign means in this case. It represents each and every element in the list y and helps to iterate over them without necessity of describing it in a direct way. It can be substituted with another variable crated in place by parser. The same thing is achieved in stream API of Java 8 with lambdas, but single underscore sign is not allowed it this case:
IntStream.range(1, 4).map(_a -> _a * 2).forEach(System.out::print);
Python code should print list containing three elements like below:
[‘b’, ‘c’, ‘d’]