Converted to a Go app

models/question.go

@@ -0,0 +1,58 @@
+package models
+
+import (
+	"errors"
+	"math/rand"
+
+	"lmika.dev/pkg/modash/moslice"
+)
+
+type QuestionSet struct {
+	Questions []Question
+}
+
+type Choice struct {
+	Text    string
+	IsRight bool
+}
+
+type Question struct {
+	Text    string
+	Choices []Choice
+	Fact    string
+}
+
+func (q Question) Render() (RenderedQuestion, error) {
+	choices := moslice.MapIndex(q.Choices, func(c Choice, i int) RenderedChoice {
+		return RenderedChoice{
+			ID:   i + 1,
+			Text: c.Text,
+		}
+	})
+	rand.Shuffle(len(choices), func(i, j int) {
+		choices[i], choices[j] = choices[j], choices[i]
+	})
+	_, idx, ok := moslice.FindWithIndexWhere(q.Choices, func(c Choice) bool { return c.IsRight })
+	if !ok {
+		return RenderedQuestion{}, errors.New("question does not have a right answer")
+	}
+
+	return RenderedQuestion{
+		Question:    q.Text,
+		Fact:        q.Fact,
+		Choices:     choices,
+		RightChoice: idx + 1,
+	}, nil
+}
+
+type RenderedChoice struct {
+	ID   int
+	Text string
+}
+
+type RenderedQuestion struct {
+	Question    string
+	Fact        string
+	Choices     []RenderedChoice
+	RightChoice int
+}