Number Rules

Number validation rules for integer and double validation.

NumberRules.moreThan()

Validates that a number is strictly greater than a specified value.

Syntax

NumberRules.moreThan<T extends num>(T value, {String? message})

Parameters

• value (T extends num, required) - The value that the input must be greater than
• message (String?, optional) - Custom error message

Default Error Message

"Value must be more than {value}"

Example

final priceSchema = Validasi.number<double>([
  NumberRules.moreThan(0.0, message: 'Price must be positive'),
]);

print(priceSchema.validate(0.01).isValid); // true
print(priceSchema.validate(0.0).isValid); // false

NumberRules.moreThanEqual()

Validates that a number is greater than or equal to a specified value.

Syntax

NumberRules.moreThanEqual<T extends num>(T value, {String? message})

Parameters

• value (T extends num, required) - The minimum value allowed (inclusive)
• message (String?, optional) - Custom error message

Default Error Message

"Value must be more than or equal to {value}"

Example

final stockSchema = Validasi.number<int>([
  NumberRules.moreThanEqual(0, message: 'Stock cannot be negative'),
]);

print(stockSchema.validate(0).isValid); // true
print(stockSchema.validate(-1).isValid); // false

NumberRules.lessThan()

Validates that a number is strictly less than a specified value.

Syntax

NumberRules.lessThan<T extends num>(T value, {String? message})

Parameters

• value (T extends num, required) - The value that the input must be less than
• message (String?, optional) - Custom error message

Default Error Message

"Value must be less than {value}"

Example

final temperatureSchema = Validasi.number<double>([
  NumberRules.lessThan(100.0, message: 'Temperature must be below boiling point'),
]);

print(temperatureSchema.validate(99.9).isValid); // true
print(temperatureSchema.validate(100.0).isValid); // false

NumberRules.lessThanEqual()

Validates that a number is less than or equal to a specified value.

Syntax

NumberRules.lessThanEqual<T extends num>(T value, {String? message})

Parameters

• value (T extends num, required) - The maximum value allowed (inclusive)
• message (String?, optional) - Custom error message

Default Error Message

"Value must be less than or equal to {value}"

Example

final percentSchema = Validasi.number<double>([
  NumberRules.lessThanEqual(100.0, message: 'Percentage cannot exceed 100'),
]);

print(percentSchema.validate(100.0).isValid); // true
print(percentSchema.validate(100.1).isValid); // false

NumberRules.finite()

Validates that a number is finite (not infinity or NaN).

Syntax

NumberRules.finite({String? message})

Parameters

• message (String?, optional) - Custom error message

Default Error Message

"Value must be finite"

Example

final schema = Validasi.number<double>([
  NumberRules.finite(message: 'Must be a valid number'),
]);

print(schema.validate(42.0).isValid); // true
print(schema.validate(double.infinity).isValid); // false
print(schema.validate(double.nan).isValid); // false

See Also

• Number Validation Examples