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Why Hymans Use F#
- 1. Keith Harrison Why Hymans Use F#
- 6. Pragmatic
- 8. public class Multiplier { public int Factor; public int Calculate(int value) { return value * Factor; } } var tenMultiplier = new Multiplier { Factor = 10 }; var result = tenMultiplier.Calculate(2);
- 9. let createMultiplier (factor) = fun x -> x * factor let multiplyByTen = createMultiplier(10) let result = multiplyByTen(2)
- 11. let filter people = let results = new List<Person>() for person in people do if person.Age > 30 then results.Add(person) results
- 12. let filter people age = let results = new List<Person>() for person in people do if person.Age > age then results.Add(person) results
- 13. let filter people = let results = new List<Person>() for person in people do if person.Sex = Sex.Male then results.Add(person) results
- 14. let filter filterFunction people = let results = new List<Person>() for person in people do if filterFunction() then results.Add(person) results
- 15. let filter filterFunction people = let results = new List<Person>() for person in people do if filterFunction() then results.Add(person) results filter (fun p -> p.Age > 30) personList filter (fun p -> p.Age > 40) personList filter (fun p -> p.Sex = Sex.Male) personList
- 16. let isOver30 p = p.Age > 30 let isOver40 p = p.Age > 40 let isMale p = p.Sex = Sex.Male filter isOver30 personList filter isOver40 personList filter isMale personList
- 17. filter isOver30 personList personList |> filter isOver30
- 18. personList |> filter isOver30 |> filter isMale
- 19. Pragmatic
- 24. Books
- 25. We’re Hiring • www.hymans.co.uk/contact-us.aspx • http://careers.stackoverflow.com/uk/company/hymans-robertson • keith.Harrison@hymans.co.uk • @KeithDHar • http://www.linkedin.com/in/keithdharrison
- 26. Questions?
Notas del editor
- I’m keithharrisonI’m a .Net Developer at Hymans RobertsonHere to talk about why Hymans use F#
- Start with a bit of back groundWho are Hymans?Actuarial Consultancy FirmModel risk using complex mathematical modelsFor example in a pension scheme calculate how much money you need today to pay each member till the last one dies. Mortality, pay rises, how long each member stay with the company
- Problem?Port legacy excel application to .NetInteroperation with other systemsUnit Testing
- What problem does F# solve with F#?Familiar to someone with a maths backgroundLeverage maths skills
- Compose maths formulas to solve different problemsCalculation such as mortality, discounting cashflows are used to solve lots of different problems.
- How is F# familiar to people with a strong maths background?
- C# code.You need to understand, classes, access modifiers, scope, constructors, object initialisers
- Same solution in F#Explain F# syntax‘let’ names a value or a functionStrongly typed, Types are inferredClosure
- Explaincomposibility
- What if we wanted to filter people over 40?
- Add age variableWhat if we wanted to filter Men?
- Same as previous functions except if statement
- Same as previous functions except if statement
- Multi - paradigm
- ConclusionPorted legacy system to F#Quickly train up actuaries to expand the teamReuse the math functionsPragmatic convert imperative to F# -> function and use power of .Net framework