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option
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universe (module lock_free)
└─
lock_free
├─
Map
├─
Sieve_Cache
(1 arg)
└─
stack
option
option
option
(T
type
)
:
switch T, nil
,
orderable
,
hashable
[Contains abstract features]
[Module base]
¶
[src]
option -- feature wrapping a value or nothing
option represents an optional value of type T
Type Parameters
T
:
Any
[Module base]
¶
[src]
Functions
group_hashable_by
(K
type
:
property.hashable
, f
Unary K T
)
=>
container.Map K (Sequence T)
[Inherited from
Sequence
]
¶
[src]
group the elements of this sequence by a key of type K
f determines the key of an element
0.097dev (GIT hash 4fdfc3160d9df4641ee0c680b4f89bf1eb6d4133)
last changed: 2026-06-24
option represents an optional value of type T