feat(and): improve represenation

validators/operators/and.ts

@@ -41,4 +41,10 @@ export class AndValidator<In, In_ extends Via, Via extends In = In & In_>
       return;
     }
   }
+
+  override toString(): string {
+    const intl = new Intl.ListFormat("en");
+
+    return intl.format(this.validators.map(String));
+  }
 }

validators/operators/or.ts

@@ -2,7 +2,6 @@
 // This module is browser compatible.
 
 import { isEmpty, maxBy } from "../../deps.ts";
-import { displayOr } from "../utils.ts";
 import {
   Reporter,
   ValidationContext,
@@ -53,6 +52,8 @@ export class OrValidator<in In = unknown, In_ extends In = In>
   }
 
   override toString(): string {
-    return displayOr(...this.validators);
+    const intl = new Intl.ListFormat("en", { type: "disjunction" });
+
+    return intl.format(this.validators.map(String));
   }
 }

validators/utils.ts

@@ -1,20 +1,6 @@
 // Copyright 2023-latest Tomoki Miyauchi. All rights reserved. MIT license.
 // This module is browser compatible.
 
-export function displayOr(
-  v1: unknown,
-  v2: unknown,
-  ...values: readonly unknown[]
-): string;
-export function displayOr(
-  ...args: readonly [unknown, unknown, ...readonly unknown[]]
-): string {
-  const head = args.slice(0, -1);
-  const last = args.slice(-1)[0];
-
-  return head.join(", ") + " or " + last;
-}
-
 /**
  * @throws {RangeError} If max less than or equal to min.
  */