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October 4, 2025 15:57
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HardcoreSyntaxSugar-LinkedIn-Post
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| open System.Collections.Generic | |
| type ListBuilder() = | |
| member _.Yield(x) = | |
| let dotnetList = new List<_>() | |
| do dotnetList.Add(x) | |
| dotnetList | |
| member _.YieldFrom(list) = list | |
| member _.Zero() = new List<_>() | |
| member _.Combine(list1: List<_>, list2) = | |
| list1.AddRange(list2) | |
| list1 // 'return' | |
| member _.For(xs, body) = | |
| let list = new List<_>() | |
| for x in xs do | |
| list.Add(body x) | |
| list // 'return' | |
| member _.Delay(f) = f () | |
| let myList = ListBuilder() | |
| // ------ | |
| // [1; 2] | |
| myList { | |
| yield 1 | |
| yield 2 | |
| } | |
| // [1; 2] | |
| myList { | |
| 1 // 'yield' | |
| 2 // 'yield' | |
| } | |
| // [1; 3] | |
| myList { | |
| 1 // 'yield' | |
| if false then | |
| 2 // 'yield' | |
| 3 // 'yield' | |
| } | |
| // [1; 2; 3; 4] | |
| myList { | |
| 1 | |
| yield! myList {2; 3} | |
| 4 | |
| } | |
| // [2; 4; 6; 8] | |
| myList { | |
| for i in 1..4 do | |
| yield i * 2 | |
| } | |
| // [2; 3; 3; 4] | |
| myList { | |
| for i in 1..2 do | |
| for j in 1..2 do | |
| i + j | |
| } |
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