Learn how to write a simple request parser that passes your initial unit test, using pattern matching on arrays and date/time parsing.
- [Instructor] But of course we haven't got a parse function…so we're going to go ahead and make that.…Parse, let Parse, we might as well call the parameter,…text, so text is a string.…And what's that going to return?…Well it needs to return an instance or query.…So let's just do a failing test…by returning some trivial stuff from there.…So once again, I'm going to copy that code there…and just return empty strings just so we've got a compiling…but failing test.…
DateTime.MinValue is quite a good one to use…for failing tests.…Oh and we've got a failing test here.…By the way, you'll sometimes find that visual studio's…editor compilation lags somewhat.…So although we're getting a syntax error there…or an error there because it's saying value…or constructor parse is not allowed,…we know this code is compilable…because n crunch compiled it and ran the test…so you can safely just ignore that.…What's the error?…Well, you'd expect an error wouldn't you…because we aren't actually parsing the data.…
Let's have a look.…Here.…
Author
Released
12/20/2016- Defining values and calling functions in F#
- Defining and identifying discriminated unions
- Working with if-else expressions
- Writing unit test
- Using type providers to access data
- Analyzing data with collection functions
- Plotting data using the R type provider
- Using railway-oriented programming to handle errors
- Integrating with Twitter
- Deploying an F# application to Azure
Skill Level Intermediate
Duration
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Introduction
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Welcome59s
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Exercise files41s
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1. Get Started with F#
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Record type and arrays2m 35s
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Forward piping3m 39s
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Array mapping and iteration6m 22s
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If-else expressions2m 9s
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Exception handling2m 40s
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Option types5m 9s
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The bot and type signatures4m 19s
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2. Build a Simple Parser with Unit Testing
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Install NUnit4m 23s
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Write a real test4m 31s
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Write a parser5m 8s
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Refactor tests5m 18s
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Test unhappy paths4m 1s
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Challenge35s
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Solution3m 38s
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3. Use F# CSV Type Provider to Get Data
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Recap and code tidy-up1m 51s
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Introducing Quandl1m 52s
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Challenge1m 14s
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Solution9m 34s
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4. Analyze Data with F# Collection Functions
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5. Use RStats Provider and ggplot2 to Plot Data
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RStats and ggplot21m 38s
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Develop the chart generator5m 45s
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Challenge38s
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Solution2m 21s
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6. Use BoxKite with Twitter
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Create a Twitter application5m 24s
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React to directed tweets4m 47s
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7. Deploy a Working Bot
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Call the reply function1m 17s
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Try the bot running locally1m 53s
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Understanding ROP2m 37s
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Conclusion
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Next steps1m 46s
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Video: Write a parser