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zw-utils
zw-utils
index
isUnDef
Function isUnDef
is
Un
Def
<
T
>
(
val
?:
T
)
:
val
is
T
Returns
whether value is undefined
Type Parameters
Type Parameters
T =
unknown
Parameters
Optional
val:
T
value to be judge
Returns
val
is
T
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zw-
utils
dom
index
Fn
is
Client
is
Boolean
is
Browser
is
Def
is
Empty
Object
is
Error
is
Function
is
Loose
Falsy
is
Loose
Truthy
is
Number
is
Object
is
Promise
is
Strict
Falsy
is
Strict
Truthy
is
String
is
Un
Def
is
Window
run
run
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Returns
whether value is undefined