l.num()

Passes when the value is num, which covers int and double. Returns a NumValidator with .min(), .max() and .finite() taking num limits. Use it for JSON numbers whose representation you do not control.

Signature

NumberValidator<num, num?> num({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 number. value is replaced by the field name when there is one.

Code generation

A num parameter maps to l.num(). @HasMin(n) and @HasMax(n) add .min(n) and .max(n), and n may be fractional.

Example

Hand-written

final amount = l.num();

Generated

@HasMin(0) @HasMax(1.5) required num ratio, // l.num().min(0).max(1.5).required()

amount.validate(input)+2-1

1. +valid: 42
2. +valid: 4.2
3. -invalid: '1'value must be a number