JSPM

Get the first path that exists on disk of multiple paths

Get the first fulfilled promise that satisfies the provided testing function

Minimal async jobs utility library, with streams support

Map over promises concurrently

Firefox 17-26 iterators throw a StopIteration object to indicate "done". This normalizes it.

`Iterator.prototype`, or a shared object to use.

Map object keys and values into a new object

Create an error from multiple errors

Filter object keys and values into a new object

A tiny, zero-dependency yet spec-compliant asynchronous iterator polyfill/ponyfill for ReadableStreams.

Iterator abstraction based on ES6 specification

Get an iterator for any JS language value. Works robustly across all environments, all versions.

Higher order iterator library for JavaScript/TypeScript.

Reduce a list of values using promises into a promise for a value

Array methods for ES6 Iterators

Filter promises concurrently

Iterate over promises serially

Minimal zero-dependency utilities for using JavaScript Iterables in all environments.

Convert an argument into a valid iterator. Based on the `.makeIterator()` implementation in mout https://github.com/mout/mout.

Map over promises serially

Run promise-returning & async functions in series, each passing its result to the next

Iterate any JS iterator. Works robustly in all environments, all versions.

Creates an async iterator for a variety of inputs in the browser and node. Supports fetch, node-fetch, and cross-fetch

Iterate any iterable JS value. Works robustly in all environments, all versions.

Run promise-returning & async functions concurrently with optional limited concurrency

Small library to simplify working with Generators and Iterators in Javascript / Typescript

`AsyncIterator.prototype`, or a shared object to use.

Wait for a specified number of promises to be fulfilled

Create an error from multiple errors

Wait for any promise to be fulfilled

An ESnext spec-compliant shim/polyfill/replacement for all Well-Known Symbols that works in any environment with Symbols.

Settle promises concurrently and get their fulfillment value or rejection reason with optional limited concurrency

A zero-dependency cron parser and scheduler for Node.js, Deno and the browser.

Iterator over lines in a string

ES6 iterator based read/write bit streams with support for variable word widths

Simple iterator for flat and multi section lists

Deques are a generalization of stacks and queues

A finite state machine iterator for JavaScript

An iterable that you can push values into

Recursively iterates over arrays and objects

Get the default iterator or async iterator for an iterable or async iterable

iterator for mini-html-parser

Composable functional (async) iterable helpers

Higher order functions for iterators and async iterators

Iterator library for JavaScript and TypeScript

Convert Node.js streams to streaming iterables

Test whether all promises passes a testing function

Utility to "pipe" async iterables together

Streaming length prefixed buffers with async iterables

The iterable toolbox

Execute a method out from an object.

Inline tokens iterator for markdown-it markdown parser.

Read an exact number of bytes from a binary (async) iterable

Fast random sampling using reservoir sampling

Generate random numbers that are consecutively unique

Reduces an object to a value that is the accumulated result of running each property in the object through a callback. Executes the callback function once for each own enumerable property in the object, receiving four arguments: the initial value (or valu

filter a javascript iterator

Simple async iterables for websocket client connections

Run promise-returning & async functions in series

Library of associative containers; it implements TreeMap, TreeSet, TreeMultiMap and TreeMultiSet classes

Retrieves the value of a specified property from all elements in the collection.

It iterates through a graph or a tree recursively

Symbol iterator.

TypeScript-STL (Standard Template Library, migrated from C++)

Flexible and performant utility for traversing javascript objects

Asynchronously calls a function on each element in an array in parallel.

Fun with Iterables

Detect native Symbol.iterator support.

Make any iterator or iterable abortable via an AbortSignal

fs.readdir with sync, async, streaming, and async iterator APIs + filtering, recursion, absolute paths, etc.

PostCSS plugin to iterate through values

Create handshakes for binary protocols with iterable streams

Create async iterator from regular stream

Cycle through the items of an array

Concat all buffers/strings yielded from an async iterable into a single BufferList/string

Foundation for async iterators as streams

Converts iterable objects into readable streams.

Split an iterable into evenly sized chunks

Apply a function to an array from then end to the beginning.

Openapi tools common libraries

ndjson to async iterator

RequestAnimationFrame friendly async for iterator

Collection of ~170 lightweight, composable transducers, reducers, generators, iterators for functional data transformations

Transform input into equally-sized blocks of output

An async iterator that joins multiple other async iterators in order, one after another.

Provide helpers that polyfill all methods defined in [iterator helpers proposal](https://github.com/tc39/proposal-iterator-helpers), both for `Iterator` and `AsyncIterator`, and even more.

Fast Async Iterator for browser Readable Streams.

Reduce an array of values via an asynchronous function.

Array like linked list with iterator

Asynchronously calls a function on each element in an array in series.

Creates a prefetched async iterable

The iterable toolbox

A blazing fast recursive directory crawler with lazy sync and async iterator support.

A doubly linked list implementation

Uint8Array async iterator adapters for Node.js streams

The Type Conversion Library. Numbers, Strings, Arrays, Maps, Objects, and Iterators.

Chai assertions for iterable objects

Async iterator utilities

Standard iterator utilities.

Create an error from multiple errors. This is a fork of sindresorhus/aggregate-error, but with CommonJS support.

Map over promises concurrently. This is a fork of sindresorhus/p-map, but with CommonJS support.

Double-linked lists with comprehensive set of operations (incl. optional self-organizing behaviors)

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Async iterator for GitLab API based on axios

Reads text lines from stream

Node-RED nodes to help flow looping.

Test if a value is iterator-like.

merges async iterators

An implementation for Array.fromAsync, which dumps an async iterator into an array.

A dead simple round-robin array iterator

HighWatermark Processing with Async Iterators

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wrangle deep nested object entries

Typescript wrapper for pg-query-stream

Functional sequences for processing iterable data in JavaScript

A library built for ES6 iteration protocol.

Parallel mapping for async iterators

Adds a counter integer to iterated values.

Creates an iterator that finishes immediately.

Base iterator for values retrieved using a stack of async functions returning values

ES2015 generator (iterable iterator) for cartesian product. Put combinatorial explosion back in the kennel.

Convert a (async) iterator to a pull stream

Convert an async iterator/iterable to a readable stream

Convert a pull stream to an async iterator

Base iterator for extract iterators like tar-iterator and zip-iterator

Array-based color types, CSS parsing, conversions, transformations, declarative theme generation, gradients, presets

A simple agent for performing a sequence of http requests in node.js

Test whether some promise passes a testing function

XZ Decompression Library

Return an iterator's length.

type AnyIterable<T>

Extract contents from zip archive type using an iterator API using streams or paths. Use stream interface and pipe transforms to add decompression algorithms

A collection of utilities for iterations.

Iterate over an Array received on the input, giving the next element only after it receives a feedback

Extract contents from tar archive type using an iterator API using streams or paths. Use stream interface and pipe transforms to add decompression algorithms

Calls async iterator next using a callback format

fs.readdir with sync, async, streaming, and async iterator APIs + filtering, recursion, absolute paths, etc.

Backoff generators usable as simple iterables

Linq-Collections (ES5): [IEnumerable, IQueryable, ...] + [List, Dictionary, Stack, ... + readonly]

Combine Multiple Asynchronous Iterators in one (not a sequence)

Maximize the parallel calls of an iterator supporting asyncIterator interface

Extract contents from 7z archives using an iterator API. Pure JavaScript, works on Node.js 0.8+

An iterable is a sequence of values.

Converts any DOM node/s to a loopable array

Rust-like Option and Result for TypeScript with near-zero allocations for extreme performance

[a]synchronous functional programming

Create an iterator which iterates over grapheme clusters.

Sorted set data structures

Resolve and reduce an array of promises

Like `await Promise.all(mytasks.map(async (item) => ....))`, but with super-powers

A toolbox to check if an object is iterable, an iterator or a generator, etc.

Assign a value to a property in an Array iterator

Complete implementation of Language-Integrated Query (LINQ) (ECMAScript 2015 Language Specification)

Simple terminal progress indicator made for any loop

Node-RED nodes to looping (fixed steps, condition based or iterating over arrays, objects, maps, sets, string).

Binary data related transducers & reducers

Progress bar in console for Node.js in the style of TQDM Python library

ASync CLasses + ASync ITerators

Complete implementation of Language-Integrated Query (LINQ) (ECMAScript 5.1 Language Specification)

HTML/SVG/XML serialization of nested data structures, iterables & closures

Deeply Iterate over Arrays. Like calling array.flat()[Symbol.iterator](), but without the memory cost

typeguard functions to determine whether or not a value is iterable or an iterator in the ES6 sense

Provides LINQ-like fluent api operations for iterables and async iterables (ES2018+).

Event Collections

Create an iterator from an array-like object.

Linq-Collections (ES5): [IEnumerable, IQueryable, ...] + [List, Dictionary, Stack, ... + readonly]

Browser-friendly fork of sindresorhus/map-obj

Convert an observable to ES6 async generator.

inform an iterator when it is prematurely terminated by the consumer.

Deep iteration of any object or iterable collection.

Turn Node.js Events into Async Iterables

push items to pulling iterators

Query library for ECMAScript iterables.

EcmaScript's CreateArrayIterator abstract operation

async iteratormethod as module.

Create an iterator for generating pseudorandom numbers drawn from a continuous uniform distribution.

Observe changes to the DOM using an async iterable — A nicer API for MutationObserver

Clojure inspired, composable ES6 iterators & generators

2D grid and shape iterators w/ multiple orderings

Modular testing for JavaScript

Create an iterator for generating uniformly distributed pseudorandom numbers between 0 and 1.

Create an iterator which invokes a unary function accepting a single numeric argument for each iterated value.

JS utils


Create a deferred async iterator.

Test if a value is iterable-like.

A lazy functional iteration library supporting sync, async, and concurrent iteration.

Headless 2D shape drawing, filling & rasterization for arbitrary targets/purposes (no canvas required)

Use requestAnimationFrame as an async iterable, in any JavaScript environment

Fast execution of an array of functions with the same value as input that can be altered.

Linq-Collections (ES5): [IEnumerable, IQueryable, ...] + [List, Dictionary, Stack, ... + readonly]

Primitives & operators for Communicating Sequential Processes based on async/await and async iterables

Lightweight vanilla ES6 UI component trees with customizable branch-local behaviors

Functions for working with iterators in JavaScript, with TypeScript

Datetime types, relative dates, math, iterators, composable formatters, locales

Extended itertools port for TypeScript and JavaScript. Provides a huge set of functions for working with iterable collections (including async ones)

turns WebSocket into async iterator

An AsyncReiterable is an append-only collection that allows multiple asynchronous iterations.

A familiar set of functions that operate on JavaScript iterables (ES2015+) in a similar way to .NET's LINQ does with enumerables.

Conversion and preparation of thi.ng/geom shapes & shape groups to/from AxiDraw pen plotter draw commands

A utility for creating an iteratively cached (memoized) result of an iterable.

Assorted file I/O utils (w/ logging support) for NodeJS/Bun

An iter function for JavaScript

wrap async/sync Iterable as an asyncIterable

Iterable to Array for JavaScript

Push iteration protocol

LINQ-like syntax using tagged templates.

Fast 2D contour line extraction / generation

JS syntax transformation framework for @effectful/js

Iterable abstract class for TypeScript

Internal APIs for VS Code's utilities and user interface building blocks.

Simple async iterables for websocket client connections

Create an iterator which returns evenly spaced numbers over a specified interval.

Chained iterator for TypeScript

Composable signal generators, oscillators, filters, FFT, spectrum, windowing & related DSP utils

Iterable mapping functions for JavaScript

Deep iteration of any object or iterable collection. (This version revised by @msablanet)

An essential Array.prototype[Symbol.iterator] polyfill for legacy browsers.

A B-tree based map with support for ordered iteration, range queries, and non-unique keys

promise-style async sequence flow-control

Stream iterators and other stream utils

An extension of the Iterator class with additional utility helper functions.

Iterator next function for JavaScript

Async file walk iterator

A typescript class that converts arrays into a loopable, O(1) lookup HashMap

transform input into equally-sized blocks of output using async iterators

A counting function for JavaScript

Adds missing values, keys and entries functions to native es6 collection implementations

Combinatorial string generator using spintax syntax

execute an async transform and yield in order of completion

A range function for JavaScript

AsyncQueue is a TypeScript class that provides a simple asynchronous queue implementation. It implements the `Symbol.asyncIterator` interface, allowing it to be used in `for-await-of` loops. This enables one or multiple consumers to process items in the q

Item repetition for JavaScript

Python-esque iterator for number ranges

Get array items one-by-one and remember the current one.

A basic iterator result.

Concurrent union

additional plugins for asynquence

[a]synchronous functional programming

Calculate fibonacci numbers for endless iterations.

Functional and asynchronous conjurations for Javascript

Iterable zipping functions for JavaScript

Lazy number range generator

Time and dates iterator using momentjs

Read text file (remote over HTTP(S) or local) line by line as async iterator, with Node, browsers and Deno

The very core of `xrange`, provided as a separate package

Call .next() on generators.

lazy fluent iterators

Iterable consumption for JavaScript

Asynchronously map object keys and values into a new object