JSPM

Rotate all items in an array

Rotate an array by a given number of steps

Rotate a matrix in either direction.

Rotates the elements of an array in place. Supports rotation in both directions and automatically wraps rotations which are larger than the input array size.

Rotates values in array.

Rotate a 2D matrix by 90 degrees clockwise with one command

Get the first fulfilled promise that satisfies the provided testing function

Get the first path that exists on disk of multiple paths

Get the native type of a value.

Array#isArray for older browsers

Determines if an object can be used as an array

User-friendly glob matching

Tiny queue data structure

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`

Minimal async jobs utility library, with streams support

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.

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.

Run an array of functions in parallel

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

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

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

List of binary file extensions

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

Robustly get the byte offset of a Typed Array

A list of SPDX license identifiers

Flatten nested arrays

Is this value a JS SharedArrayBuffer?

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

Robustly get the byte length of a Typed Array

A simple list of possible Typed Array names.

extend like a boss

Robustly get the length of a Typed Array

Convert a value to an array

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

Detect whether or not an object is a Typed Array

Simply swizzle your arguments

TypedArray polyfill for old browsers

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

Array manipulation, ordering, searching, summarizing, etc.

An ESnext spec-compliant `Array.prototype.toSorted` 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 `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

Creates a shallow clone of any JavaScript value.

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

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

Remove duplicate values from an array. Fastest ES5 implementation.

Parse postgres array columns

a few common utility template tags for ES2015

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

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

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

Rotates values in array.

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

Sort the keys of an object

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

Map `visit` over an array of objects.

Create an array by repeating the given value n times.

Recursively flatten an array or arrays.

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

Utils for working with JavaScript classes and prototype methods.

Create an array without duplicates

Iterator abstraction based on ES6 specification

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

Turn anything into an array

Get a compare function for array to sort

Guarantees an array back

Isomorphic, functional type-checking for Javascript

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

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

List of text file extensions

ES2015 `Array#findIndex()` ponyfill

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

Join paths and globs.

Array methods for ES6 Iterators

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

Removes duplicates from a sorted array in place

Like an array, but rounder.

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

Get the longest item in an array.

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

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

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

Replace or remove multiple items in an array.

Check if two arrays are equal

Typescript-compatible minimalistic shallow equality check for arrays/objects

Microsoft sucks

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

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

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

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

ES spec-compliant shim for TypedArray.prototype.slice

Concatenate a readable stream's data into a single array

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.

List of Markdown file extensions

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

Run an array of functions in series

Array#filter for older browsers.

Get the last or last n elements in an array.

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

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

Validates if a value is an array.

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

Validates if a value is an integer array.

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

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

Faster alternative to javascript's native filter method.

Computes the greatest common divisor (gcd).

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

Computes the least common multiple (lcm).

An optionally-asynchronous forEach with an interesting interface.

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

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.

Rotates values in array.

make a shallow copy of an object or array

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

filter in array tree

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

Sort the keys in an object.

Sort array elements in ascending order.

Treat multiple buffers as one

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

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

Sort array elements in descending order.

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

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

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

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

Make any value an array. No dependencies.

Microsoft sucks

Multidimensional Arrays

`[].reduce()` for old browsers

Make array iteration easy when using async/await and Promises

Watch an object or array for changes

Generates an array of consecutive integers starting at 0

Check whether a value is "empty".

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

Test if a value is a Float64Array.

Float32Array.

Test if a value is a Uint32Array.

Float64Array.

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

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

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

Test if a value is a Uint8Array.

Test if a value is a Uint16Array.

Uint8Array.

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

Maximum unsigned 32-bit integer.

Safely push each item of an array to a stream

Sort an array on an object property

Return a data type from a string representing the type

Packs an array-of-arrays into a single ndarray

Test if a value is a Float32Array.

Uint32Array.

Uint16Array.

Deep-merge the values of one object structure into another

Initialize an array of arrays to a constant

Rearrange array elements by index array

creates a new array with given range

List of getter/setter properties for JavaScript types

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

Find [nd-]array min/max values

flattens nested vertex data into a typed array

Simple iterator for flat and multi section lists

Deep copy objects and arrays

Move an array item to a different position

Convert Buffer to ArrayBuffer

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

List of properties for JavaScript objects

List of JavaScript types

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

Makes easy to convert JSON to CSV

The swiss army knife for binary data in JavaScript.

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

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.

Array / Arraylike utilities

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

Chai plugin for JSON Schema v4

Creates a real Array from almost anything.

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

Merge two lists, trying to preserve the order of both

Computes the dot product between two numeric arrays.

Computes the cosine similarity between two arrays.

Extensible deep value equivalence checking for any data types

Return true if the given number is even.

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

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

Functional tree editing, manipulation & navigation

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

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.

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

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

Recursively iterates over arrays and objects

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

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

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

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.

Module for working with CIDR (v4, v6)

Rotates two-dimensional arrays clockwise by 90 degrees, 180 degrees, or 270 degrees

List of common default router IP addresses

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

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

Sort string index ranges

A utility function to index arrays by any criteria

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

recursive object extending & overriding

Lazily initialized properties for objects

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

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

Pipe an Array through Node.js streams

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.

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

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

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

Asynchronous iterator function for parallel processing.

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.

Returns an array filled with the specified input

Check if the given value is an Array

Randomize the order of the elements in a given array.

Fast intersection of multiple arrays

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.

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

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

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

Execute a method out from an object.

Create an error from an array of error messages

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

Rotate array by n positions

Find the intersection of two arrays

remove items from a javascript array without generating memory garbage

create a new array filled with a value, or zero

Get consecutively unique elements from an array

A map function that can map over almost anything.

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

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

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

Uppercase first character of each element in arrays of strings.

Group array of objects into lists.

List of video file extensions

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

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

Collection of image extensions