function Arr.mapSparseimport { Arr } from "https://deno.land/x/rimbu@1.0.3/base/mod.ts"; const { mapSparse } = Arr; mapSparse<T, T2>(arr: readonly T[], f: (value: T, index: number) => T2): T2[]Type ParametersTT2Parametersarr: readonly T[]f: (value: T, index: number) => T2ReturnsT2[]