Return type | Name and parameters |
---|---|
boolean
|
asBoolean()
Coerce an Optional instance to a boolean value. |
Optional
|
collect(Closure transform)
If the optional contains a value, returns an optional containing the transformed value obtained using the transform closure
or otherwise an empty optional.
|
addShutdownHook
, any
, any
, asBoolean
, asType
, average
, collect
, collect
, collect
, contains
, count
, dump
, each
, eachWithIndex
, equals
, every
, every
, find
, find
, findAll
, findAll
, findIndexOf
, findIndexOf
, findIndexValues
, findIndexValues
, findLastIndexOf
, findLastIndexOf
, findResult
, findResult
, flatten
, getAt
, getMetaClass
, getMetaPropertyValues
, getProperties
, grep
, grep
, groupBy
, groupBy
, hasProperty
, identity
, inject
, inject
, inspect
, invokeMethod
, is
, isCase
, iterator
, join
, metaClass
, print
, print
, printf
, printf
, println
, println
, println
, putAt
, respondsTo
, respondsTo
, setMetaClass
, size
, split
, sprintf
, sprintf
, sum
, sum
, tap
, toArrayString
, toSpreadMap
, toString
, use
, use
, use
, with
, with
, withTraits
Coerce an Optional instance to a boolean value.
true
if a value is present, otherwise false
If the optional contains a value, returns an optional containing the transformed value obtained using the transform
closure
or otherwise an empty optional.
assert Optional.of("foobar").collect{ it.size() }.get() == 6 assert !Optional.empty().collect{ it.size() }.isPresent()
transform
- the closure used to transform the optional value if present