at (method)

Abstract at

• at<R>(index): OptSafe<R>

• Get an item at given index of an array/string wrapped in Opt. Resulting value is wrapped in Opt. Non-existent index results in None. Negative index is interpreted as an index from the end of the array (e.g. a last item of an array lies on an index equal to -1).

  Type Parameters

  • R extends unknown

  Parameters

  • index: number

  Returns OptSafe<R>

  Example

  opt([1]).at(0) // Some(1)
  opt([]).at(0) // None
  none.at(0) // None
  opt([null]).at(0) // None
  opt([1, 2, 3]).at(-1) // Some(3)
  opt('Palico').at(0) // Some('P')
  

  See

  at