Get a sub array using array of indexes in one step

Question

In C#, given an array of integers that represents indexes of an array of items, is there a way to get a sub-array of the array of items that correspond to indexes in one step?

int[] indexesArray = {0,2,4,1};
string[] itemsArray = {"hi", "ciao", "yo"," hey","hello"};

string[] result = builtinMagic(itemsArray, indexesArray);

This is called *slicing* – Panagiotis Kanavos Jun 14 '17 at 10:37 — Panagiotis Kanavos, Jun 14 '17 at 10:37
Use a 2D/ multidimensional array? – fluffy Jun 14 '17 at 10:37 — fluffy, Jun 14 '17 at 10:37

score 5 · Accepted Answer · answered Jun 14 '17 at 10:38

5

You can simply Select the index from the indexesArray and then get the item at that specific index:

string[] result = indexesArray.Select(idx => itemsArray[idx]).ToArray();

answered Jun 14 '17 at 10:38

Patrick Hofman

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You are too fast for me :) – Pikoh Jun 14 '17 at 10:39
2

I have that a lot ;) – Patrick Hofman Jun 14 '17 at 10:39

Get a sub array using array of indexes in one step

1 Answers1