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@thames/monads
@thames/monads
isLeft
Function isLeft
is
Left
<
L
,
R
>
(
val
)
:
val
is
LeftEither
<
L
,
R
>
Type guard for checking if an Either is a Left.
Type Parameters
L
extends
NonUndefined
R
extends
NonUndefined
Parameters
val
:
Either
<
L
,
R
>
Returns
val
is
LeftEither
<
L
,
R
>
Deprecated
Use
Either.isLeft
instead.
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Type guard for checking if an Either is a Left.