JSPM

Get the first fulfilled promise that satisfies the provided testing function

Get the first path that exists on disk of multiple paths

Array#isArray for older browsers

Get the native type of a value.

Determines if an object can be used as an array

Fill in a range of numbers or letters, optionally passing an increment or `step` to use, or create a regex-compatible range with `options.toRegex`

User-friendly glob matching

prelude.ls is a functionally oriented utility library. It is powerful and flexible. Almost all of its functions are curried. It is written in, and is the recommended base library for, LiveScript.

Tiny queue data structure

Minimal async jobs utility library, with streams support

Run an array of functions in parallel

Which kind of Typed Array is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.

Is this value a JS Typed Array? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.

Create an array of unique values, in order, from the input arrays

List of binary file extensions

Returns true if a value is a plain object, array or function.

Flatten nested arrays

Is this value a JS SharedArrayBuffer?

Robustly get the byte length of a Typed Array

An ES7/ES2016 spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3.

An ES2019 spec-compliant `Array.prototype.flat` shim/polyfill/replacement that works as far down as ES3.

Is this value a JS ArrayBuffer?

ES spec-compliant shim for ArrayBuffer.prototype.slice

A simple list of possible Typed Array names.

An ES2019 spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.

extend like a boss

A list of SPDX license identifiers

Robustly get the length of a Typed Array

Robustly get the byte offset of a Typed Array

Simply swizzle your arguments

Detect whether or not an object is a Typed Array

Convert a value to an array

An ESnext spec-compliant `Object.groupBy` shim/polyfill/replacement that works as far down as ES3.

Push an array of items into an array, while being robust against prototype modification

TypedArray polyfill for old browsers

An ESnext spec-compliant `Array.prototype.findLastIndex` shim/polyfill/replacement that works as far down as ES3.

Returns true if any values exist, false if empty. Works for booleans, functions, numbers, strings, nulls, objects and arrays.

An ESnext spec-compliant `Array.prototype.findLast` shim/polyfill/replacement that works as far down as ES3.

An ESnext spec-compliant `Array.prototype.toSorted` shim/polyfill/replacement that works as far down as ES3.

Recursively (deep) clone JavaScript native types, like Object, Array, RegExp, Date as well as primitives.

Array manipulation, ordering, searching, summarizing, etc.

Returns true if a value exists, false if empty. Works with deeply nested values using object paths.

Creates a shallow clone of any JavaScript value.

Parse postgres array columns

Remove duplicate values from an array. Fastest ES5 implementation.

A static list of the Node.js builtin modules from the latest Node.js version

Combines a list of arrays, returning a single array with unique values, using strict equality for comparisons.

Returns an array with only the unique values from the first array, by excluding all values from additional arrays using strict equality for comparisons.

a few common utility template tags for ES2015

Set an array of unique values as the property of an object. Supports setting deeply nested properties using using object-paths/dot notation.

Sort the keys of an object

Visit a method over the items in an object, or map visit over the objects in an array.

Create an array by repeating the given value n times.

Recursively flatten an array or arrays.

Map `visit` over an array of objects.

Create an array without duplicates

Utils for working with JavaScript classes and prototype methods.

Iterator abstraction based on ES6 specification

Get a compare function for array to sort

Check if a string matches the name of a Node.js builtin module

Turn anything into an array

Isomorphic, functional type-checking for Javascript

Guarantees an array back

No-bullshit, ultra-simple, 35-lines-of-code async parallel forEach / map function for JavaScript.

List of text file extensions

Create an array with values that are present in the first input array but not additional ones

An ES5 spec-compliant `Array.prototype.reduce` shim/polyfill/replacement that works as far down as ES3.

Join paths and globs.

ES2015 `Array#findIndex()` ponyfill

Convert a string/promise/array/iterable/asynciterable/buffer/typedarray/arraybuffer/object into a stream

Array methods for ES6 Iterators

Like an array, but rounder.

Removes duplicates from a sorted array in place

Array-slice method. Slices `array` from the `start` index up to, but not including, the `end` index.

Get the longest item in an array.

Loop over each item in an array and call the given function on every element.

Replace or remove multiple items in an array.

Natural Sort algorithm for Javascript - Version 0.7 - Released under MIT license

A simple and composable way to validate data in JavaScript (and TypeScript).

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

Check if two arrays are equal

Return true if a value is a valid glob pattern or patterns.

Typescript-compatible minimalistic shallow equality check for arrays/objects

Concatenate a readable stream's data into a single array

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

ES spec-compliant shim for TypedArray.prototype.slice

Lightweight and performant natural sorting of arrays and collections by differentiating between unicode characters, numbers, dates, etc.

Microsoft sucks

List of Markdown file extensions

An ES5 spec-compliant `Array.prototype.map` shim/polyfill/replacement that works as far down as ES3.

Find the greatest satisfied semver range from an array of ranges.

Run an array of functions in series

An ES5 spec-compliant `Array.prototype.filter` shim/polyfill/replacement that works as far down as ES3.

Isomorphic map-reduce function to flatten an array into the supplied array

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

An ESnext spec-compliant `Array.prototype.toReversed` shim/polyfill/replacement that works as far down as ES3.

Get the last or last n elements in an array.

Run an array of functions in parallel, but limit the number of tasks executing at the same time

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

Validates if a value is an integer array.

A ponyfill for the ES 2015 (ES6) `Array.from()`.

Get all but the last element or last n elements of an array.

Validates if a value is an array.

Faster alternative to javascript's native filter method.

Computes the greatest common divisor (gcd).

Fast and powerful array sorting. Sort an array of objects by one or more properties. Any number of nested properties or custom comparison functions may be used.

Array#filter for older browsers.

Computes the least common multiple (lcm).

Faster, node.js focused alternative to JavaScript's native array map.

make a shallow copy of an object or array

Treat multiple buffers as one

An optionally-asynchronous forEach with an interesting interface.

Sort array elements in descending order.

`Array#forEach()` but it’s possible to define where to move to next

filter in array tree

ES6 Array.find ponyfill. Return the first array element which satisfies a testing function.

finds an item in an array matching a predicate function, and returns its index

Sort the keys in an object.

Sort array elements in ascending order.

[](https://www.npmjs.com/package/levenary) [](https://github.com/tanhauhau/levenary/actions)

`[].map(f)` for older browsers

Make any value an array. No dependencies.

A faster Node.js alternative to Array.prototype.slice.call(arguments)

Multidimensional Arrays

Watch an object or array for changes

Sorts any JavaScript array in a predictable way (deep equal arrays are always sorted in the same order)

Microsoft sucks

`[].reduce()` for old browsers

Generates an array of consecutive integers starting at 0

Make array iteration easy when using async/await and Promises

Check whether a value is "empty".

Find the first element in an array that passes a callback test. Equivalent to underscore.find()

Safely push each item of an array to a stream

Sort an array on an object property

Test if a value is an array.

Return a function which tests if every element in an array passes a test condition.

Reuse typed arrays

Returns true if the given number is odd, and is an integer that does not exceed the JavaScript MAXIMUM_SAFE_INTEGER.

A tiny, faster alternative to native Array.prototype.every

Maximum unsigned 32-bit integer.

Return a data type from a string representing the type

Float64Array.

Packs an array-of-arrays into a single ndarray

Test if a value is a Float32Array.

Test if a value is a Uint8Array.

Uint8Array.

Uint16Array.

Test if a value is a Uint16Array.

Uint32Array.

A simple and composable way to validate data in JavaScript (and TypeScript).

Test if a value is a Float64Array.

Float32Array.

Deep-merge the values of one object structure into another

Test if a value is a Uint32Array.

Initialize an array of arrays to a constant

Rotate all items in an array

Convert Buffer to ArrayBuffer

Find [nd-]array min/max values

Simple iterator for flat and multi section lists

creates a new array with given range

Rearrange array elements by index array

Move an array item to a different position

flattens nested vertex data into a typed array

Normalize array (possibly n-dimensional) to zero mean and unit variance

Deep copy objects and arrays

List of properties for JavaScript objects

The swiss army knife for binary data in JavaScript.

List of JavaScript types

Utilities to get and check variable types (isString, isPlainObject, isRegExp, etc)

List of getter/setter properties for JavaScript types

Makes easy to convert JSON to CSV

Returns an array containing the initial elements which both input arrays have in common

More than 130 Handlebars helpers in ~20 categories. Helpers can be used with Assemble, Generate, Verb, Ghost, gulp-handlebars, grunt-handlebars, consolidate, or any node.js/Handlebars project.

Rotate an array by a given number of steps

Comma delimit an array for human readability, the Oxford comma is optional.

Array / Arraylike utilities

Computes the dot product between two numeric arrays.

Computes the cosine similarity between two arrays.

Creates a real Array from almost anything.

Compare your item to items in an array and get the closest one.

Isomorphic, load-anywhere function to sort an array by scalar, deep or computed values in any standard or custom order

Chai plugin for JSON Schema v4

A fast implementation of a fisher-yates shuffle that does not mutate the source array.

Extensible deep value equivalence checking for any data types

Merge two lists, trying to preserve the order of both

Wrapper for [braces] to enable brace expansion for arrays of patterns.

Recursively iterates over arrays and objects

Functional tree editing, manipulation & navigation

Get unique values of an array. Really, like deeply unique.

Return true if the given number is even.

high-performance, zero-dependency circular reference check for objects (or arrays)

An ES5 spec-compliant `Array.prototype.every` shim/polyfill/replacement that works as far down as ES3.

Computes the L2 norm (Euclidean norm) of an array of values.

Returns a copy of an object, sorted deeply by its keys, without mangling any arrays inside of it

Give eachr an item to iterate (array, object or map) and an iterator, then in return eachr gives iterator the value and key of each item, and will stop if the iterator returned false.

Flatten a nested array.

An RxJS map operator that takes an observable of arrays as input and emits arrays where each element represents emissions from the projected observable.

List of common default router IP addresses

Returns true if the given is falsey (according to JavaScript) or matches a 'falsey' keyword.

Module for working with CIDR (v4, v6)

Adds array support to node-glob, sync and async. Also supports tilde expansion (user home) and resolving to global npm modules.

🔧 Fast, modern, and practical utility library for FP in TypeScript.

A utility function to index arrays by any criteria

Reduce an array to unique values, optionally into a separate array.

recursive object extending & overriding

Object -> [[key0, value0], [key1, value1]...]

Lazily initialized properties for objects

Sort string index ranges

Asynchronous iterator function for parallel processing.

Join all elements of an array and create a human-readable string

Run an array of functions in series, each passing its results to the next function (waterfall)

More than 130 Handlebars helpers in ~20 categories. Helpers can be used with Assemble, Generate, Verb, Ghost, gulp-handlebars, grunt-handlebars, consolidate, or any node.js/Handlebars project.

Parse dotenv files for Boolean, Array, and Number variable types, built for CrocodileJS

Promised First-In-First-Out buffer. Await on push to be told when a value is consumed and await on shift for a value to consume when the buffer is empty.

Turn an array into a list of comma-separated values, appropriate for use in an English sentence.

Check if the given value is an Array

Fast intersection of multiple arrays

Read, write or test a data structure's nested property via a string like 'my.nested.property'. It works through arrays and objects.'

Pipe an Array through Node.js streams

Like lodash's _.defaultsDeep, but with array preservation

Randomize the order of the elements in a given array.

Execute a method out from an object.

Async array reduce. Asynchronously applies a function against an accumulator and each element in an array (from left to right, in series) to reduce it to a single value.

Create an error from an array of error messages

Returns an array filled with the specified input

A complete, fully tested data structure library written in TypeScript.

create a new array filled with a value, or zero

remove items from a javascript array without generating memory garbage

An ES spec-compliant `Array.prototype.forEach` shim/polyfill/replacement that works as far down as ES3.

Transform dot-delimited strings to array of strings for Node.js and the browser.

Get consecutively unique elements from an array

A data structure that combines a hash and an array for fast dictionary lookup and traversal by complex keys.

Convert Gitignore to Glob patterns

Remembers the highest/lowest values in a data set of any size.

Collection of image extensions

A function for iterating over objects, arrays, strings and ranges

Find the intersection of two arrays

List of video file extensions

Blazing fast, tree-shakeable, type-safe, modern utility library to sort any type of array in less than 1 KB!

Bind data arrays to any type of JS objects

A map function that can map over almost anything.

Creates and makes an array without duplicates. Even with array of objects with a specified matcher.

A parallel, asynchronous implementation of forEach in ES6 with a configurable maximum degree of parallelism.

Uppercase first character of each element in arrays of strings.

Circular fixed size array

Sort objects by property names using native Array.sort()

Group array of objects into lists.

Sparse array implementation in JS with no dependencies

Simple javascript lib for converting a [comma || space] delimited string to an array