countIn ()
count
In
<
T
>
(
p
)
:
(
(
x
)
=>
Opt
<
number
>
)
Type Parameters
T
Parameters
p
:
(
(
x
)
=>
boolean
)
(
x
)
:
boolean
Parameters
x
:
T
Returns
boolean
Returns
(
(
x
)
=>
Opt
<
number
>
)
(
x
)
:
Opt
<
number
>
Parameters
x
:
Opt
<
T
[]
>
Returns
Opt
<
number
>
See
Opt.countIn
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See
Opt.countIn