External module "math/base/special/fibonacci-index/docs/types/index.d"

Export assignment fibonacciIndex

• fibonacciIndex(F: number): number

• Computes the Fibonacci number index.

  Notes

  • If not provided a nonnegative integer value, the function returns NaN.
  • If provided F <= 1 or NaN, the function returns NaN.

  Parameters

  • F: number

    Fibonacci number

  Returns number

  Fibonacci number index

  Example

  var n = fibonacciIndex( 0 );
  // returns NaN

  Example

  var n = fibonacciIndex( 1 );
  // returns NaN

  Example

  var n = fibonacciIndex( 2 );
  // returns 3

  Example

  var n = fibonacciIndex( 3 );
  // returns 4

  Example

  var n = fibonacciIndex( 5 );
  // returns 5

  Example

  var n = fibonacciIndex( 8 );
  // returns 6

  Example

  var n = fibonacciIndex( NaN );
  // returns NaN

  Example

  var n = fibonacciIndex( 3.14 );
  // returns NaN

  Example

  var n = fibonacciIndex( -1 );
  // returns NaN