JSPM

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

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

Run an array of functions in series

Get the last or last n elements in an array.

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

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

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

Validates if a value is an array.

Validates if a value is an integer array.

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

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

Array#filter for older browsers.

Faster alternative to javascript's native filter method.

Computes the greatest common divisor (gcd).

Computes the least common multiple (lcm).

make a shallow copy of an object or array

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

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

An optionally-asynchronous forEach with an interesting interface.

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.

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

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

Treat multiple buffers as one

filter in array tree

Sort array elements in descending order.

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)

Make any value an array. No dependencies.

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

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

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

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

Multidimensional Arrays

Microsoft sucks

Watch an object or array for changes

Make array iteration easy when using async/await and Promises

`[].reduce()` for old browsers

Generates an array of consecutive integers starting at 0

Check whether a value is "empty".

Test if a value is an array.

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

Maximum unsigned 32-bit integer.

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

Test if a value is a Uint8Array.

Test if a value is a Uint16Array.

Float64Array.

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

Reuse typed arrays

Safely push each item of an array to a stream

Uint8Array.

Sort an array on an object property

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

Test if a value is a Uint32Array.

Test if a value is a Float64Array.

Float32Array.

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

Return a data type from a string representing the type

Uint32Array.

Uint16Array.

Packs an array-of-arrays into a single ndarray

Test if a value is a Float32Array.

Deep-merge the values of one object structure into another

Initialize an array of arrays to a constant

creates a new array with given range

Rotate all items in an array

Rearrange array elements by index array

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

Find [nd-]array min/max values

Convert Buffer to ArrayBuffer

Simple iterator for flat and multi section lists

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

Move an array item to a different position

Deep copy objects and arrays

List of getter/setter properties for JavaScript types

flattens nested vertex data into a typed array

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

List of properties for JavaScript objects

List of JavaScript types

The swiss army knife for binary data in JavaScript.

Makes easy to convert JSON to CSV

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

Array / Arraylike utilities

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.

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

Extensible deep value equivalence checking for any data types

Computes the dot product between two numeric arrays.

Computes the cosine similarity between two arrays.

Creates a real Array from almost anything.

Functional tree editing, manipulation & navigation

Merge two lists, trying to preserve the order of both

Return true if the given number is even.

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

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

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

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

Recursively iterates over arrays and objects

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

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.

List of common default router IP addresses

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

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

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

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

Module for working with CIDR (v4, v6)

Flatten a nested array.

A utility function to index arrays by any criteria

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

recursive object extending & overriding

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

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.

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

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

Lazily initialized properties for objects

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

Sort string index ranges

Asynchronous iterator function for parallel processing.

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

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

Check if the given value is an Array

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

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.

Pipe an Array through Node.js streams

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

Fast intersection of multiple arrays

Randomize the order of the elements in a given array.

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

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.

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

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

Create an error from an array of error messages

Hiccup shape tree renderer for vanilla Canvas 2D contexts

List of video file extensions

Get consecutively unique elements from an array

Convert Gitignore to Glob patterns

remove items from a javascript array without generating memory garbage

Find the intersection of two arrays

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.

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.

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

Uppercase first character of each element in arrays of strings.

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

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

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

Sparse array implementation in JS with no dependencies

Collection of image 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

Circular fixed size array

Group array of objects into lists.

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

A BBCode to AST Parser part of @bbob

Randomize the order of items in an array

Convert base64/datauri/plain string to ArrayBuffer

Count leading zeros in a Buffer (clz)

Utility for modifying / processing the contents of Javascript objects or arrays via object notation strings or globs.

flatten() utility function

Returns `true` if the given string or array starts with prefix using strict equality for comparisons. Using fastest implementation.

compare two collections

Returns `true` if the given `string` or `array` ends with `suffix` using strict equality for comparisons.

Check if an object is an array or a typed array

Prettier plugin to force all arrays to be multiline.

An ES-spec-compliant (proposed) Array.prototype.at shim/polyfill/replacement that works as far down as ES3

Works like String.prototype.replace but outputs an array. Useful for replacing parts of the string with objects of other types.

Set of (possibly rotated) arrays

Convert an array to a csv formatted string

When you want array.some but not array.every. Useful when you need to determine partially selected states - like partially selecting tree nodes when some but not all child nodes are checked.

find all combinations from array

MongoDB-style object operators makes array manipulation easy: where/order/update/view

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

Swap two items in an array. Does not modify the Array prototype.

Implementation of paper 'An O(ND) Difference Algorithm and Its Variations' on array

Convert any binary data to ArrayBuffer

Replaces `arr.includes(val)' with `arr.indexOf(val) >= 0`.

List of US states and territories.

Run promise-returning & async functions in series

dedupes an array

a map from arrays of values to values

In an array of objects, this enables a property on the object at the specified index, while disabling the property on all other objects.

Transforms nested values of complex objects

Chunk converts arrays like `[1,2,3,4,5]` into arrays of arrays like `[[1,2], [3,4], [5]]`.

Optimized 2d/3d/4d and arbitrary length vector operations, support for memory mapping/layouts

Composite utilities (immutability, fp helpers)

Returns `true` if a value exists in the given string, array or object.

Maximum length for a typed array.

Casts the given value to a flatten array, and removes falsey items (similar to lodash compact).

return the number of bytes in a unicode string

Detect which ES6 (ES2015 and above) features are available

Invoke getter/setter functions on array-like objects

Returns the first index at which a given element can be found.

Get the Depth of a Multi-Dimensional Array of Values

Test if a value is a collection.

Memory-Aware Statistical Calculations

Create a filled generic array.

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

Test if a value is an Int32Array.

Uint8ClampedArray.

Helper library for getting all of the states and territories of the United States in the specific format that you need.

qsu is a utility library that contains useful and frequently used functions. Start with your preferred language and the modern development environment.

Array-map like function for objects.

Maximum unsigned 32-bit integer.

Compute the cartesian product of an array.

Check whether a value is empty or blank, includes string whitespace support

Quickest Way to get the Minimum Value of an Array of Numbers (Typed or Untyped)

Fun with Iterables

Array#filter() with also detecting indexes of filtered values

Create a zero-filled generic array.

Int8Array.

Multi-Dimensional Functions. Create, Query, and Transform Multi-Dimensional Data.

Sort the keys of an object recursively

Int16Array.

Converts an array of items with ids and parent ids to a nested tree in a performant `O(n)` way. Runs in browsers and node.

Put non-empty strings into arrays, turn empty-ones into empty arrays. Bypass everything else.

Fuzzy match a command from a list (typo-safety)

Transforms nested keys of complex objects

Allows deep cloning of plain objects that contain primitives, nested plain objects, or nested plain arrays.

Test if a value is an Int8Array.

Check if a value is an array or a typed array

Validates if a value is array-like.

HashMap Class for JavaScript

Shuffle Array based on a Seed

common javascript utils that can be required selectively that assume es5+

Get or set a deep value using a keypath string. Supports bracket and dot notation

Create an object from from arrays of keys and values

Easily create a normalized inquirer choices question. Supports all of the `choices` question types: checkbox, list, rawlist, expand

List of prototype properties for JavaScript types

Quickest Way to get the Maximum Value of an Array of Numbers (Typed or Untyped)

Fast, generic JavaScript/node.js utility functions.

Computes array dimensions.

Component-wise operations on ndarrays

Return the first index at which a given element can be found.

write logs to js Array

Copy or deep clone a value to an arbitrary depth.

Get the Smallest and Largest Possible Numbers for a Typed Array

short-circuited, asynchronous version of Array.protototype.some

Maximum length for a generic array.

Test if a value is a Uint8ClampedArray.

Int32Array.

Test if a value is an Int16Array.

Perform data joins with any type of JS objects

Sort an array using the merge-sort algorithm.