Looping through two arrays and adding the collection of each into new array without dups

Question

I have two arrays that I want to loop through. Array A and Array B. I want to add the elements of both array into a new Array that contains the collection of all elements in that array without any duplication. This will be written in python.

For Example
A = [1,2,3,4]
B = [1,5,6,7]
Collection = [1,2,3,4,5,6,7]

I was wondering if there's a faster and more efficient to do it without looping through each indexes and comparing it and then storing it. Because that's what I'm planning to do but I think it will take really long time given that I have about a couple thousand elements in each array.

`Collection = list(set(A+B))` – splash58 Oct 03 '19 at 17:43 — splash58, Oct 03 '19 at 17:43

score 2 · Answer 1 · answered Oct 03 '19 at 17:43

2

There is, using set:

A = [1,2,3,4]
B = [1,5,6,7]
C = set(A + B)

If you want C to be a list instead, simply convert it back afterwards:

C = list(set(A + B))

answered Oct 03 '19 at 17:43

Lord Elrond

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how would you convert it back afterwards ? – Vathana Him Oct 03 '19 at 17:45
@VathanaHim using `list()`, like in my last line. – Lord Elrond Oct 03 '19 at 17:46
this would not include any duplicates right ? – Vathana Him Oct 03 '19 at 17:46
@VathanaHim Yes, that is what `set` does, removes duplicates. – Lord Elrond Oct 03 '19 at 17:47
1

ok sweet i'm new to python so idk but thanks :) – Vathana Him Oct 03 '19 at 17:48
@VathanaHim How are you combining the lists? My code as is should work fine. – Lord Elrond Oct 03 '19 at 17:54
nevermind it was some syntax error – Vathana Him Oct 03 '19 at 18:28

Looping through two arrays and adding the collection of each into new array without dups

1 Answers1