List Schema

Use Validasi.list<T>() to validate lists.

The schema is generic, so you choose the item type with T.

• Validasi.list<String>(...) for list of strings
• Validasi.list<int>(...) for list of integers
• Validasi.list<MyType>(...) for custom types

import 'package:validasi/validasi.dart';
import 'package:validasi/rules.dart';

final tagsSchema = Validasi.list<String>([
	IterableRules.minLength(1),
]);

Available Rules

IterableRules.minLength

Ensures the list has at least the given number of items.

final atLeastTwoTags = Validasi.list<String>([
	IterableRules.minLength(2),
]);

print(atLeastTwoTags.validate(['dart']).isValid); // false
print(atLeastTwoTags.validate(['dart', 'flutter']).isValid); // true

IterableRules.forEach

Validates each item using another schema.

final emailListSchema = Validasi.list<String>([
	IterableRules.forEach(
		Validasi.string([
			StringRules.minLength(5),
		]),
	),
]);

print(emailListSchema.validate(['a@b.c', 'test@example.com']).isValid); // true
print(emailListSchema.validate(['x', 'test@example.com']).isValid); // false

Nested List Validation

IterableRules.forEach can validate nested structures by composing list schemas.

final matrixSchema = Validasi.list<List<int>>([
	IterableRules.minLength(1),
	IterableRules.forEach(
		Validasi.list<int>([
			IterableRules.minLength(2),
			IterableRules.forEach(
				Validasi.number<int>([
					NumberRules.moreThanEqual(0),
				]),
			),
		]),
	),
]);

print(matrixSchema.validate([
	[1, 2],
	[3, 4],
]).isValid); // true

print(matrixSchema.validate([
	[1],
	[3, -1],
]).isValid); // false

This approach makes list validation composable: each nesting level has its own list rules.

Combining List Rules

Use both list-specific rules together for shape and item validation.

final usernamesSchema = Validasi.list<String>([
	IterableRules.minLength(1),
	IterableRules.forEach(
		Validasi.string([
			StringRules.minLength(3),
			StringRules.maxLength(20),
		]),
	),
]);

final result = usernamesSchema.validate(['alice', 'bob']);
print(result.isValid); // true