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isNone
Function isNone
isNone
<
T
>
(
maybe
:
Maybe
<
T
>
)
:
maybe
is
{
_tag
:
"None"
}
Type-narrowing predicate: returns
true
when the value is
None
.
Type Parameters
T
Parameters
maybe
:
Maybe
<
T
>
Returns
maybe
is
{
_tag
:
"None"
}
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Type-narrowing predicate: returns
truewhen the value isNone.