How do I filter an array based on object's property with multiple OR statements

Question

The question was difficult to put into words, but here is my situation. I have several Monster objects in an array called monsters. Each monster has a name property which is a String. I have a second array called monsterNames, which contains several monster names (as Strings).

I want to be able to filter all the monster objects in monsters array based on whether the individual monster object's name property appears in the monsterNames array.

I have been looking at solutions so far I have only found solutions that filter based on a single condition, which allows me to only filter based on a single monster name in the monsterNames array. Can anybody help me find an efficient solution to this?

fdiaz · Accepted Answer · 2016-09-06 02:41:34Z

9

You could do something like:

let monsters: [Monster] = ...

let monsterNames: [String] = ...

let filteredMonsters = monsters.filter { monsterNames.contains($0.name) }

This doesn't perform all that well, since it will go over the names array up to n times for each monster, but if your names arrays is small, this won't be a problem.

answered Sep 6, 2016 at 2:41

fdiaz

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1 Comment

Leo Dabus Over a year ago

I think the OP is trying to remove the ones that matches any monsterName so I think he wants monsters.filter {!monsterNames.contains($0.name) }

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