isLastIndex

The isLastIndex() function indicates whether an index corresponds to the last element of an array. It is curried to fit easily into compositions or reductions.

Interactive example

Syntax

Classic signature

function isLastIndex<
  GenericInput extends readonly unknown[],
>(
  input: GenericInput,
  index: number,
): boolean

Curried signature

function isLastIndex<
  GenericInput extends readonly unknown[],
>(
  index: number,
): (input: GenericInput) => boolean

Parameters

• input: Target array.
• index: Index to test.

Return value

true if index points to the last element of the array, false otherwise.

See also

• lastIndexOf - Gives the index of the last occurrence
• length - Returns the size of an array
• reduce - Reduces an array to one value