noneWhen ()
none
When
<
T
>
(
returnNone
)
:
(
(
x
)
=>
Opt
<
T
>
)
Type Parameters
T
Parameters
returnNone
:
boolean
Returns
(
(
x
)
=>
Opt
<
T
>
)
(
x
)
:
Opt
<
T
>
Parameters
x
:
Opt
<
T
>
Returns
Opt
<
T
>
See
Opt.noneWhen
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See
Opt.noneWhen