existsIn (method)

existsIn

• existsIn<U>(this, p): Opt<boolean>

• Checks if any element in the array inside the Opt satisfies the predicate. Similar to Array.some from JavaScript.

  Type Parameters

  • U

  Parameters

  • this: Some<U[]>

  • p: ((x) => boolean)

    • • (x): boolean

      • Parameters

        • x: U

        Returns boolean

  Returns Opt<boolean>

  Example

  opt([1]).existsIn(x => x > 0) // Some(true)
  opt([-1]).existsIn(x => x > 0) // Some(false)
  opt([]).existsIn(x => x > 0) // Some(false)
  none.existsIn(x => x > 0) // None