Checks if a given value is undefined.
isUndefined(null) // => falseisUndefined(undefined)// => trueisUndefined(10)// => false Copy
isUndefined(null) // => falseisUndefined(undefined)// => trueisUndefined(10)// => false
The type of the input value.
The value to be checked.
true if the value is undefined, false otherwise.
true
false
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Checks if a given value is undefined.
Example