l.bool()

Passes when the value is a bool. Returns a BoolValidator<bool?>. Strings such as 'true' fail. To require true rather than any bool, add a custom validator.

Signature

BoolValidator<bool?> bool({String? message, MessageBuilder? messageBuilder})

Parameters

Parameter	Type	Meaning
message	String?	Replaces the default error message.
messageBuilder	MessageBuilder?	Builds the message from the issue. message wins when both are given. See Message builders.

Issue

Code invalidType. Default message: value must be a bool. value is replaced by the field name when there is one.

Code generation

A bool parameter maps to l.bool().

Example

Hand-written

final flag = l.bool();

Generated

required bool acceptedTerms, // l.bool().required()

flag.validate(input)+2-1

1. +valid: true
2. +valid: false
3. -invalid: 'true'value must be a bool