Iterpal

Iterable tools for JavaScript.

Installation

Iterpal is available from the npm registry:

npm install iterpal

With Deno:

import { filter, map } from "https://evanhahn.com/tape/iterpal/0.3.0/mod.ts";

Documentation

API documentation

Use cases

• Get helpful utilities not in the standard library.

  last is a simple one, but there are many others:

  import { last } from "iterpal";
  last("iterpal!");
  // => "!"

• Use collection utilities like map and filter with any iterable.

  That includes arrays, strings, sets, maps, typed arrays, buffers, streams, (async) generators, or anything implementing the interface.

  import { filter } from "iterpal";
  const letterOs = filter("foo", (c) => c === "o");

• Take advantage of lazy iteration.

  Many of Iterpal's functions return lazily, which can help you maintain a functional style while still enjoying performance benefits.

  import { map, take } from "iterpal";
  
  // The second operation is faster because
  // it iterates over fewer values.
  lotsOfNumbers.map(square).slice(10);
  lotsOfNumbers.slice(10).map(square);
  
  // These two operations are basically equivalent.
  take(map(lotsOfNumbers, square), 10);
  map(take(lotsOfNumbers, 10), square);