NullModel

Model for missing values (null)

implements: hash, method, sequence<NullModel>, scalar
bundle: standard information structure (sismodel)
since 5.2.0
Model for missing values (null)

Model for missing value (null); behaves like neutral element.

The NullModel is not behaving like null for the freemarker operations ! and ??.

• Avoid using '!' operator
• Replace '??' operator by '?has_content'

[used as sequence][Integer:any] ↦ NullModel
since 5.2.0
returns itself ignoring given index 'any'

[used as boolean] ↦ Boolean
since 5.2.0
returns false

[used as scalar] ↦ String
since 5.2.0
returns empty string

Defined hash keys

<String:any> ↦ NullModel
since 5.2.0
returns itself ignoring given key 'any'

Methods

[used as method](Object:any) ↦ NullModel
since 5.2.0
returns itself

Built-Ins

?has_content ↦ false
since 5.2.0
returns false

[used as sequence]?size ↦ Integer
since 5.2.0
returns 0 (zero) always