20250123 関数型DDD 3

Transcript

1. ؔ਺ܕDDDଓ͖
2. લճ
3. ୯७ܕ
4. type ProductCode = ProductCode of string
5. type ProductCode = { Type: "ProductCode"; value: string; };
6. ܕΛ࢖͓͏
7. type OrderQuantity = | UnitQuantity of int | KilogramQuantity of decimal
8. let anOrderQtyInUnits = UnitQuantity 10 let anOrderQtyInKg = KilogramQuantity 2.5 let printQuantity aOrderQty = match aOrderQty with | UnitQuantity uQty -> printfn "%i units" uQty | KilogramQuantity kgQty -> printfn "%g kg" kgQty
9. type OrderQuantity = | UnitQuantity of int | KilogramQuantity of decimal | BoxQuantity of f loat // ૿΍͢ͱ // ίϯύΠϧΤϥʔ
10. ύλʔϯϚον
11. TSʹ͸ͳ͍
12. switch
15. ໰୊఺
17. ૿͑ͯ΋ίϯύΠϧͰ͖ ͪΌ͏
18. ํ๏1ɿneverΛ࢖͏
20. ํ๏2ɿaslant
21. switch-exhaustiveness- check
22. LintͳͷͰίϯύΠϧ͸Ͱ͖Δɻ ಛʹܕͷύλʔϯΛ૿΍ͨ࣌͠
23. ํ๏3ɿts-pattern