elemOfIn (method)

elemOfIn

• elemOfIn(haystack): boolean

• Checks if the value inside the Opt is an element of the given array. Flipped version of Opt.hasIn.

  Parameters

  • haystack: readonly T[]

    The array to check against

  Returns boolean

  true if the value is in the array, false otherwise

  Example

  opt(1).elemOfIn([1, 2, 3]) // true
  opt(4).elemOfIn([1, 2, 3]) // false
  none.elemOfIn([1, 2, 3]) // false
  opt('cow').elemOfIn(['dog', 'cow', 'pig']) // true
  opt('cat').elemOfIn(['dog', 'cow', 'pig']) // false
  none.elemOfIn(['dog', 'cow', 'pig']) // false
  

  See

  elemOf