Troy shows his solution to the word frequency counter problem. It is surprisingly small. He also contrasts his solution with one using traditional C++.
(intro music)…- [Instructor] How did you do with the challenge?…Hopefully, everything went well.…Let me share my solution to this challenge with you.…So, basically there are three steps.…We modify the filter operator,…we remove the count operator, and then we update the output.…And let's go ahead and start from scratch again,…and let me show you what I did.…So, here we are back in Visual Studio Code,…and what we're going to do, let's just redo…what we did previously.…
So, we're going to go ahead and say, auto values…equals rxcpp colon colon observable…and then we have iterate(ages).…Then, we have a dot to chain this together.…
Then, we're going to say filter…and we take a lambda again,…and then the lambda is going to get passed in age,…and that's going to be an integer.…And we're going to say return age,…greater than or equal to 13…and age…less than…or equal to 19,…and a semicolon.…
And then, we have another period here…to chain it together.…Then, we're going to do our subscribe.…Notice, we did not do a count at all.…
Author
Released
12/11/2018- Unit testing and functional programming
- Binding
- Function and Lambda functions
- C++ templates
- Working with the Standard Template Library and Boost.Hana
- Functional reactive programming
Skill Level Intermediate
Duration
Views
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Introduction
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1. Overview
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2. Functional Programming in Modern C++
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Enabling C++ 174m 24s
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transform instead of map5m 30s
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copy_if instead of filter2m 59s
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accumulate instead of reduce2m 51s
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bind4m 56s
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Functions6m 54s
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Lambda functions: Curry3m 38s
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Lambda functions: Closures2m 20s
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3. Template Metaprogramming
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C++ templates4m 36s
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Factorial5m 23s
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Boost.Hana5m 31s
-
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4. Functional Reactive Programming
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RxCpp library5m 21s
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Conclusion
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Next steps41s
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Video: Solution: Word frequency counter