isBoolean()
isBoolean()
isBoolean()
Checks if any
value is a boolean
type, or the obtained type from its object
class equal to 'boolean'
, or an object
type and an instance of Boolean
that is equal to true
or false
.
Generic type variables
Type
extends
AnyBoolean
=
boolean
Type
extends
AnyBoolean
=
boolean
The Type
generic type variable constrained by generic type AnyBoolean
by default of boolean
indicates the type of the given value
via the return type.
Payload
extends
object
=
object
Payload
extends
object
=
object
Parameters
value: any
value: any
The value of any
type to check.
callback: ResultCallback<any, Payload>
callback: ResultCallback<any, Payload>
payload?: Payload
payload?: Payload
Return type
value is Type
value is Type
The return type is a boolean
as the result of its statement, indicating the value
is a generic type variable Type
constrained by AnyBoolean
by default equal to the boolean
.
Returns
The return value is a boolean
indicating whether the provided value
is a boolean
type or an instance of Boolean
.
Example usage
Basic example
Parameters callback
and payload
callback
and payload
String
as boolean
String
as boolean
Boolean
as string
Boolean
as string
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