gno.land/r/moul/x/daily/orderedmapdemo/v0⧉

1// Package orderedmapdemo is a small gnoweb demo of the insertion-ordered map2// provided by the [p/moul/x/daily/orderedmap](/p/moul/x/daily/orderedmap/v0)3// library: it shows that order survives updates and deletes.4//5// It contains no map logic of its own. Stateless, so Render is deterministic —6// which is precisely what the library is for.7package orderedmapdemo89import (10	"strconv"11	"strings"1213	"gno.land/p/moul/x/daily/orderedmap/v0"14)1516// Render renders the demo for gnoweb.17func Render(path string) string {18	var b strings.Builder19	b.WriteString("# Ordered Map\n\n")20	b.WriteString("A map that remembers insertion order, demoing the ")21	b.WriteString("[`p/moul/x/daily/orderedmap`](/p/moul/x/daily/orderedmap/v0) library.\n\n")2223	o := orderedmap.New()24	for _, kv := range [][2]string{{"delta", "4"}, {"alpha", "1"}, {"charlie", "3"}, {"bravo", "2"}} {25		o.Set(kv[0], kv[1])26	}2728	b.WriteString("## Inserted\n\n")29	b.WriteString("`delta, alpha, charlie, bravo` → order kept as inserted, **not** sorted:\n\n")30	b.WriteString(table(o))3132	o.Set("alpha", "99")33	b.WriteString("\n## After `Set(\"alpha\", \"99\")`\n\n")34	b.WriteString("Updating keeps the original position — insertion order means *first* insertion:\n\n")35	b.WriteString(table(o))3637	o.Delete("charlie")38	o.Set("charlie", "new")39	b.WriteString("\n## After deleting and re-adding `charlie`\n\n")40	b.WriteString("Re-inserting is a **new** insertion, so it goes last:\n\n")41	b.WriteString(table(o))4243	b.WriteString("\n> gno map iteration order is unspecified. A realm that ranges over a ")44	b.WriteString("built-in map to build its page can emit a different page every call — ")45	b.WriteString("a consensus bug, not a cosmetic one. This is the fix.\n")46	return b.String()47}4849func table(o *orderedmap.OrderedMap) string {50	var b strings.Builder51	b.WriteString("| # | key | value |\n|---|---|---|\n")52	i := 053	o.Iterate(func(k, v string) bool {54		i++55		b.WriteString("| ")56		b.WriteString(strconv.Itoa(i))57		b.WriteString(" | `")58		b.WriteString(k)59		b.WriteString("` | `")60		b.WriteString(v)61		b.WriteString("` |\n")62		return false63	})64	return b.String()65}66