Boolean
Boolean prototype extensions
Import
_ <- fat.type.Boolean
Constructor
| Name | Signature | Brief |
|---|---|---|
| Boolean | (val: Any) | Coerce value to boolean |
Prototype members
| Name | Signature | Brief |
|---|---|---|
| isEmpty | <> Boolean | Return true if false |
| nonEmpty | <> Boolean | Return false if true |
| size | <> Number | Return 1 if true, 0 if false |
| toText | <> Text | Return 'true' or 'false' as text |
| freeze | <> Void | Make the value immutable |
Examples
_ <- fat.type.Boolean
~ x = true
x.isEmpty # false, since x is true
x.nonEmpty # true, since x is not empty
x.size # 1, since true maps to size 1
x.toText # 'true', converts boolean to text
x.freeze
x = false # raises an error, x is immutable after freeze
Boolean('false') # yields true, because text is non-empty
Boolean('') # yields false, because text is empty
note that the constructor does not attempt to convert value from text, which is consistent with flow control evaluations, and you can use a simple case if you need to make conversion from text to boolean