Learn how to link functions together into simple processing pipelines using the forward pipe operator.
- [Instructor] Now let's imagine that those ScreenItems…were part of a graphics program,…so part of the system to present values on a screen.…And maybe you only want to pick out values…which were created since a certain date and time.…This is how you would do it.…You'd declare yourself a function…called ScreenItemsCreatedSince.…Obviously you'd need to provide a value for the since time.…And you'd need to provide…an actual list of items…that you're going to sort through.…
And the way you actually achieve this…is you take the incoming items…and you call the Array.filter function.…Array is just a module of useful functions,…which you can use to do things to arrays.…And this, if you're fluent with F#, is a lambda function.…So we're declaring a function on the fly.…That function takes a single argument,…which we're going to call item.…And then the body of the function, simply returns true…if it's CreatedAt date was later than the since,…which comes in as a parameter value here.…
And let's say also we want to sort these…
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: Forward piping