Update 4.15-reflection.md #389
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WalkthroughChapter 4.15 content was renumbered from 5.15 to 4.15, Go reflection samples were updated, a new NativeCommandEngine with Exit() was added and exposed via the reflective shell, the Custom Tag example was replaced with a full reflect-based tag-reading sample, and formatting/imports were normalized. Changes
Sequence Diagram(s)sequenceDiagram
actor User
participant Shell as Sample Shell
participant Reflect as Reflection Layer
participant Engine as NativeCommandEngine
participant OS as os
User->>Shell: enter "Exit"
Shell->>Reflect: find method "Exit" on Engine
Reflect-->>Shell: method handle
Shell->>Engine: invoke Exit()
Engine->>OS: os.Exit(1)
Note right of OS: Process terminates
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes Poem
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⚠️ Outside diff range comments (1)
content/chapter 4/4.15-reflection.md (1)
110-157: Struct size example is incorrect; either use an empty struct or fix the output.With
structure := struct{ Name string }{...}, size is 16 bytes on 64‑bit, not 0. To keep the shown output, make the struct empty and clarify the text.- structure = struct{ Name string }{Name: "John Doe"} + structure = struct{}{}-در این کد، تعداد بایتهای مورد نیاز ... برای نوع ساختاری structure بایتی نیاز نیست و برابر با صفر است. +در این کد، تعداد بایتهای مورد نیاز ... برای نوع ساختار تهی (struct{}) اندازه ۰ بایت است.Also consider noting architecture dependence (e.g., 64‑bit) for sizes of int/string/slice/map.
🧹 Nitpick comments (9)
content/chapter 4/4.15-reflection.md (9)
45-45: Use proper Persian ZWNJ in the heading.Replace "تایپ های" with "تایپهای" for correct typography.
-## 4.15.3 بررسی تایپ های متغیرها +## 4.15.3 بررسی تایپهای متغیرها
277-281: Remove dead pointer-guard to reduce noise.
v := reflect.ValueOf(p)is never a pointer here; theif v.Kind()==reflect.Ptrbranch is unreachable in this snippet.- v := reflect.ValueOf(p) - if v.Kind() == reflect.Ptr { - v = v.Elem() - } + v := reflect.ValueOf(p)
308-309: Unify pluralization of “command(s)”.Pick one of "دستورات" or "دستورها" and use it consistently across the chapter. Current text mixes forms. If your style guide prefers pure Persian, use "دستورها".
Also applies to: 364-364
312-318: Tabs in code blocks trigger MD010; choose either spaces or disable the rule locally.markdownlint flags hard tabs inside fenced code. Either replace tabs with spaces in this file’s code blocks, or wrap the block with
<!-- markdownlint-disable MD010 -->/<!-- markdownlint-enable MD010 -->.
330-332: Exit should use a zero status (and optionally a farewell) for normal termination.Exiting with 1 signals error.
-func (nse NativeCommandEngine) Exit() { - os.Exit(1) -} +func (nse NativeCommandEngine) Exit() { + fmt.Println("Bye!") + os.Exit(0) +}
334-341: Broaden method lookup; support pointer-receiver methods.Using a value receiver limits discoverability/invocation. Use the pointer to cover both sets.
-func (nse NativeCommandEngine) callMethodByName(methodName string) { - method := reflect.ValueOf(nse).MethodByName(methodName) +func (nse NativeCommandEngine) callMethodByName(methodName string) { + method := reflect.ValueOf(&nse).MethodByName(methodName) if !method.IsValid() { fmt.Println("ERROR: \"" + methodName + "\" is not implemented") return } method.Call(nil) }
343-348: Show both value- and pointer-receiver exported methods.Listing on the pointer type avoids omissions.
-func (nse NativeCommandEngine) ShowCommands() { - val := reflect.TypeOf(nse) +func (nse NativeCommandEngine) ShowCommands() { + val := reflect.TypeOf(&nse) for i := 0; i < val.NumMethod(); i++ { fmt.Println(val.Method(i).Name) } }
351-360: Trim input and handle scanner errors.Improves UX and robustness.
-import ( +import ( "bufio" "fmt" "os" "reflect" + "strings" ) @@ - for scanner.Scan() { - nse.callMethodByName(scanner.Text()) + for scanner.Scan() { + cmd := strings.TrimSpace(scanner.Text()) + if cmd != "" { + nse.callMethodByName(cmd) + } fmt.Print("$ ") } + if err := scanner.Err(); err != nil { + fmt.Fprintln(os.Stderr, "ERROR:", err) + }
366-366: Use proper ZWNJ in the heading."فیلد های" → "فیلدهای".
-## 4.15.8 نوشتن custom tag برای فیلد های ساختار +## 4.15.8 نوشتن custom tag برای فیلدهای ساختار
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content/chapter 4/4.15-reflection.md
[misspelling] ~308-~308: اشتباه محتمل املائی پیداشده: دستورها.
Context: ...ی میکنید و برای اجرای توابع Go بر اساس دستورات ورودی کاربر، نیاز دارید دستورات را به ت...
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[misspelling] ~308-~308: اشتباه محتمل املائی پیداشده: دستورها.
Context: ...بر اساس دستورات ورودی کاربر، نیاز دارید دستورات را به توابع مرتبط تخصیص دهید. اگر تعداد...
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[misspelling] ~364-~364: اشتباه محتمل املائی پیداشده: دستورها.
Context: ... برنامه شلی که پیشتر نوشتیم، ابتدا تمام دستورات پشتیبانی شده را نشان میدهد. سپس کاربر ...
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[misspelling] ~364-~364: اشتباه محتمل املائی پیداشده: دستورها.
Context: ... شده را نشان میدهد. سپس کاربر میتواند دستورات را به دلخواه خود وارد کند. هر دستور شل ...
(FA_SIMPLE_REPLACE)
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🔇 Additional comments (3)
content/chapter 4/4.15-reflection.md (3)
159-159: LGTM for section retitling.
207-207: LGTM for section retitling.
256-256: LGTM for section retitling.
2 participants
4.15.7 => Add Exit method and make some enter for better code format.
4.15 => Change wrong season titles.
Summary by CodeRabbit
Documentation
New Features