isUndefined

Callable

• isUndefined(a: unknown): a is undefined

---

• Checks if x is undefined.

  Example

  isUndefined(undefined)
  // => true
  
  isUndefined(true)
  // => false
  
  isUndefined("1234")
  // => false
  
  isUndefined(null)
  // => false

  Alternatives

  • Lodash isUndefined

  ---

  Parameters

  • a: unknown

  Returns a is undefined

  true if x is a undefined, false otherwise.