ReqLen class Null safety

Convenient validator for required fields with length (number of items) constraints.

It is the composite of Req and Len validators.


ReqLen(int len, {String? blank, String? diff})
Constrains the length (number of items). [...]
ReqLen.max(int max, {String? blank, String? long})
Constrains the length or number of data items to a maximum amount. [...]
ReqLen.min(int min, {String? blank, String? short})
Constrains the length (number of items) to a minimum amount. [...]
ReqLen.range(int min, int max, {String? blank, String? short, String? long})
Constrains the length (number of items) within the range min–max. [...]


hashCode int
The hash code for this object. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


call(Object? input) String?
Valid - returns null - if input is neither null nor empty, and if its length is in a valid range. [...]
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
toString() String
A string representation of this object. [...]


operator ==(Object other) bool
The equality operator. [...]