function lensIndeximport { lensIndex } from "https://deno.land/x/rambda@9.2.1/mod.ts"; lensIndex<A>(n: number): Lens<A[], A>It returns a lens that focuses on specified index. lensIndex<A extends any[], N extends number>(n: N): Lens<A, A[N]>It returns a lens that focuses on specified index. Type ParametersAParametersn: numberReturnsLens<A[], A>Type ParametersA extends any[]N extends numberParametersn: NReturnsLens<A, A[N]>