JSPM

Get the first fulfilled promise that satisfies the provided testing function

MAM Helpers

Get the first path that exists on disk of multiple paths

Get the native type of a value.

Array#isArray for older browsers

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`

Determines if an object can be used as an array

Tiny queue data structure

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.

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

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

Array and object immutable helpers inspired by lodash

Flatten nested arrays

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

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

Is this value a JS ArrayBuffer?

Robustly get the byte offset of a Typed Array

ES spec-compliant shim for ArrayBuffer.prototype.slice

extend like a boss

Is this value a JS SharedArrayBuffer?

A simple list of possible Typed Array names.

A list of SPDX license identifiers

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

Robustly get the length of a Typed Array

Convert a value to an array

Detect whether or not an object is a Typed Array

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

Simply swizzle your arguments

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.

TypedArray polyfill for old browsers

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

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.findLastIndex` shim/polyfill/replacement that works as far down as ES3.

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.

Remove duplicate values from an array. Fastest ES5 implementation.

Parse postgres array columns

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

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.

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

Many javascript helpers

Sort the keys of an object

Helprjs is a JavaScript library that provides a whole mess of useful functional programming helpers without extending any built-in objects

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

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

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

Guarantees an array back

List of text file extensions

Isomorphic, functional type-checking for Javascript

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

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.

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.

Array methods for ES6 Iterators

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.

Check if two arrays are equal

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.

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.

List of Markdown file extensions

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

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

Run an array of functions in series

A collection of mostly functional programming helpers

Array#filter for older browsers.

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

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

Validates if a value is an array.

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

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

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

Validates if a value is an integer array.

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

Faster alternative to javascript's native filter method.

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.

Computes the greatest common divisor (gcd).

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

make a shallow copy of an object or array

Computes the least common multiple (lcm).

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

filter in array tree

Treat multiple buffers as one

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

Sort array elements in descending order.

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

Sort the keys in an object.

Sort array elements in ascending order.

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

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

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

Make any value an array. No dependencies.

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

`[].reduce()` for old browsers

Multidimensional Arrays

Microsoft sucks

Watch an object or array for changes

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".

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

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

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

Test if a value is an array.

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

Test if a value is a Float64Array.

Reuse typed arrays

Test if a value is a Uint32Array.

Sort an array on an object property

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

Float32Array.

Maximum unsigned 32-bit integer.

Float64Array.

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

Return a data type from a string representing the type

Test if a value is a Uint8Array.

Test if a value is a Uint16Array.

Uint8Array.

Packs an array-of-arrays into a single ndarray

Deep-merge the values of one object structure into another

Test if a value is a Float32Array.

Initialize an array of arrays to a constant

Uint32Array.

Uint16Array.

List of getter/setter properties for JavaScript types

Find [nd-]array min/max values

Rotate all items in an array

creates a new array with given range

Rearrange array elements by index array

flattens nested vertex data into a typed array

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

Simple iterator for flat and multi section lists

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

Deep copy objects and arrays

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.

Common typescript ready prototypes available in both CommonJS and ECMAScript

Rotate an array by a given number of steps

Array / Arraylike utilities

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

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

Composite utilities (immutability, fp helpers)

Creates a real Array from almost anything.

Chai plugin for JSON Schema v4

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

Merge two lists, trying to preserve the order of both

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.

Return true if the given number is even.

Extensible deep value equivalence checking for any data types

Computes the dot product between two numeric arrays.

Computes the cosine similarity between two arrays.

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

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.

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

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.

Lazily initialized properties for objects

Recursively iterates over arrays and objects

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

Flatten a nested array.

Sort string index ranges

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

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

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

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

Module for working with CIDR (v4, v6)

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

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

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

A utility function to index arrays by any criteria

recursive object extending & overriding

Pipe an Array through Node.js streams

Returns an array filled with the specified input

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

Asynchronous iterator function for parallel processing.

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

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.

Check if the given value is an 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.

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.'

Helpers used in react projects

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

Create an error from an array of error messages

Execute a method out from an object.

Useful JS utilities.

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

Utility package for manipulating Array compatible with Typescript projects.

remove items from a javascript array without generating memory garbage

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

Get consecutively unique elements from an array

create a new array filled with a value, or zero

Find the intersection of two arrays

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

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 function for iterating over objects, arrays, strings and ranges

Group array of objects into lists.

A map function that can map over almost anything.

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

Uppercase first character of each element in arrays of strings.

Collection of image extensions

Circular fixed size array