# Data Structures & Algorithms in Swift · Stack | raywenderlich.com

**URL:** <https://forums.kodeco.com/t/data-structures-algorithms-in-swift-stack-raywenderlich-com/60945>\
**Category:** 🎓 Courses & Articles\
**Created:** [January 29, 2019, 9:49pm UTC](https://forums.kodeco.com/t/data-structures-algorithms-in-swift-stack-raywenderlich-com/60945 "2019-01-29T21:49:24Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![catie](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/catie/32/110937_2.png) [@catie](https://forums.kodeco.com/u/catie)\
**Post date:** [January 29, 2019, 9:49pm UTC](https://forums.kodeco.com/t/data-structures-algorithms-in-swift-stack-raywenderlich-com/60945/1 "2019-01-29T21:49:24Z")

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* * *
This is a companion discussion topic for the original entry at [https://www.raywenderlich.com/977854-data-structures-algorithms-in-swift/lessons/3](https://www.raywenderlich.com/977854-data-structures-algorithms-in-swift/lessons/3)

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**Author:** ![guatambu](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/guatambu/32/81494_2.png) [@guatambu](https://forums.kodeco.com/u/guatambu)\
**Post date:** [June 28, 2019, 9:06pm UTC](https://forums.kodeco.com/t/data-structures-algorithms-in-swift-stack-raywenderlich-com/60945/3 "2019-06-28T21:06:37Z")

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Hello!  
Is there a link to a relevant unit test course on ray wenderlich?  
I searched for it, but the results were not clear.

Thank you!

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**Author:** ![catie](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/catie/32/110937_2.png) [@catie](https://forums.kodeco.com/u/catie)\
**Post date:** [June 28, 2019, 10:05pm UTC](https://forums.kodeco.com/t/data-structures-algorithms-in-swift-stack-raywenderlich-com/60945/4 "2019-06-28T22:05:48Z")

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Hi! Yes, there is a [Testing in iOS](https://www.raywenderlich.com/3530-testing-in-ios) course.

There is also a [tutorial for a quick introduction](https://www.raywenderlich.com/960290-ios-unit-testing-and-ui-testing-tutorial).

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**Author:** ![guatambu](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/guatambu/32/81494_2.png) [@guatambu](https://forums.kodeco.com/u/guatambu)\
**Post date:** [June 29, 2019, 1:52am UTC](https://forums.kodeco.com/t/data-structures-algorithms-in-swift-stack-raywenderlich-com/60945/5 "2019-06-29T01:52:34Z")

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Thank you!!!  
😀

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**Author:** ![mcneils](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/mcneils/32/81494_2.png) [@mcneils](https://forums.kodeco.com/u/mcneils)\
**Post date:** [October 2, 2019, 11:21pm UTC](https://forums.kodeco.com/t/data-structures-algorithms-in-swift-stack-raywenderlich-com/60945/6 "2019-10-02T23:21:52Z")

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Hi are there any courses were we discuss more in-depth how recursions works?

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**Author:** ![catie](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/catie/32/110937_2.png) [@catie](https://forums.kodeco.com/u/catie)\
**Post date:** [October 3, 2019, 12:34pm UTC](https://forums.kodeco.com/t/data-structures-algorithms-in-swift-stack-raywenderlich-com/60945/7 "2019-10-03T12:34:31Z")

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Hi! I don’t believe there are any videos specifically on recursion, but it’s really just fancy jargon and not a deep topic.

Functions can call other functions! Recursion is when a function calls _itself_.

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**Author:** ![algorithmbiter](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/algorithmbiter/32/81494_2.png) [@algorithmbiter](https://forums.kodeco.com/u/algorithmbiter)\
**Post date:** [September 27, 2020, 1:57pm UTC](https://forums.kodeco.com/t/data-structures-algorithms-in-swift-stack-raywenderlich-com/60945/9 "2020-09-27T13:57:01Z")

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Hello, I’m having this error - I tried to google to see why cxxLanguageStandard is not available but didn’t see any results.

`'init(name:pkgConfig:providers:products:dependencies:targets:swiftLanguageVersions:cLanguageStandard:cxxLanguageStandard:)' is unavailable`

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**Author:** ![algorithmbiter](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/algorithmbiter/32/81494_2.png) [@algorithmbiter](https://forums.kodeco.com/u/algorithmbiter)\
**Post date:** [September 27, 2020, 1:58pm UTC](https://forums.kodeco.com/t/data-structures-algorithms-in-swift-stack-raywenderlich-com/60945/10 "2020-09-27T13:58:59Z")

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looks like the package file got in the starter, and the end folder has no package in. Fixed, all is good.