exists ()
exists
<
T
>
(
y
)
:
(
(
x
)
=>
boolean
)
Type Parameters
T
Parameters
y
:
(
(
_
)
=>
boolean
)
(
_
)
:
boolean
Parameters
_
:
T
Returns
boolean
Returns
(
(
x
)
=>
boolean
)
(
x
)
:
boolean
Parameters
x
:
Opt
<
T
>
Returns
boolean
See
Opt.exists
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See
Opt.exists