Your goal in this kata is to implement a difference function, which subtracts one list from another and returns the result.
It should remove all values from list a, which are present in list b.
array_diff([1,2],[1]) == [2]
If a value is present in b, all of its occurrences must be removed from the other:
array_diff([1,2,2,2,3],[2]) == [1,3]
APPROACH: conversion second list to set filter function: The filter() method filters the given sequence with the help of a function that tests each element in the sequence to be true or not.
CODE:
def array_diff(a, b):
s = set(b)
return list(filter(lambda x: x not in b, a))```