harden business rules

core/racing/domain/value-objects/CarName.ts

@@ -0,0 +1,36 @@
+import { z } from "zod";
+
+const CarNameSchema = z
+  .string()
+  .trim()
+  .min(1, "Car name cannot be empty")
+  .max(100, "Car name must be 100 characters or less");
+
+export class CarName {
+  private readonly _value: string;
+
+  private constructor(value: string) {
+    this._value = value;
+  }
+
+  static create(value: string): CarName {
+    const validated = CarNameSchema.parse(value);
+    return new CarName(validated);
+  }
+
+  static fromString(value: string): CarName {
+    return new CarName(value);
+  }
+
+  get value(): string {
+    return this._value;
+  }
+
+  equals(other: CarName): boolean {
+    return this._value === other._value;
+  }
+
+  toString(): string {
+    return this._value;
+  }
+}