typed.go

package check

import "fmt"

// ParseTyped validates a value against a schema and returns a typed result.
// This avoids the need to type-assert the result of Parse.
//
// Usage:
//
//	name, err := check.ParseTyped[string](z.String().Min(3), "Alice")
//	age, err := check.ParseTyped[int](z.Int().Positive(), 25)
//	users, err := check.ParseTyped[[]any](z.Array(z.String()), data)
func ParseTyped[T any](schema Schema, value any) (T, error) {
	var zero T
	result, err := schema.Parse(value)
	if err != nil {
		return zero, err
	}
	if result == nil {
		return zero, nil
	}
	typed, ok := result.(T)
	if !ok {
		return zero, fmt.Errorf("type assertion failed: expected %T, got %T", zero, result)
	}
	return typed, nil
}