feat: arrayOf

LuciNyan · Feb 28, 2023 · 9c95c26 · 9c95c26
1 parent 9c5ef4d
commit 9c95c26
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/src/operator.ts b/src/operator.ts
@@ -16,5 +16,15 @@ export function intersection<T extends any[]>(
   }
 }
 
+export function arrayOf<T extends unknown[]>(...guards: { [K in keyof T]: Guard<T[K]> }): Guard<T> {
+  return function (x: unknown): x is T {
+    if (!Array.isArray(x)) {
+      return false
+    }
+
+    return x.every((item) => guards.some(guard => guard(item)))
+  }
+}
+
 export const or = union
 export const and = intersection