JSPM

Deep copy objects and arrays

make a shallow copy of an object or array

Copy or deep clone a value to an arbitrary depth.

Copy or deep clone a value to an arbitrary depth.

🐊Putout plugin adds ability to convert array copy to slice

Copy values from x into y.

A commonly used array copy utility. (arrayCopy and arrayCopyTo)

Return a partial object copy excluding specified keys.

Return a partial object copy containing only specified keys.

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

Copy the elements of an indexed array-like object to a new generic array.

Object/Array shallow copy

returns a copy of an array or object with null/undefined members removed

returns a copy of an array with falsey values removed

Copy the elements of an array-like object to a new generic array.

Object/Array shallow copy

Remove elements from a copy of an array

Filter an object by its keys or values. Returns a copy of an object filtered to have only keys or values that match the given glob patterns.

Copy values from x into y.

Unfreezes a JavaScript object/array/function etc. that has previously been frozen, by doing a deep copy.

Copy part of array to another array, like Array.slice().

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

Copy values from x into y.

Creates a shallow clone of any JavaScript value.

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

Utils for working with JavaScript classes and prototype methods.

Inserts a sub-array into an array starting at the given index. Returns a copy

Removes duplicates from a sorted array in place

ArrayLike copying for JavaScript

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

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

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

User-friendly glob matching

Tiny queue data structure

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.

Copies part of array to another.

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.

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

Run an array of functions in parallel

List of binary file extensions

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

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

Flatten nested arrays

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

ES spec-compliant shim for ArrayBuffer.prototype.slice

A simple list of possible Typed Array names.

Robustly get the byte length of a Typed Array

Is this value a JS SharedArrayBuffer?

extend like a boss

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

Is this value a JS ArrayBuffer?

Robustly get the length of a Typed Array

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 byte offset of a Typed Array

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

Return a shallow copy of a portion of an array.

Convert a value to an array

Simply swizzle your arguments

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.

The swiss army knife for binary data in JavaScript.

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

TypedArray polyfill for old browsers

Remove circular references from objects

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

Array manipulation, ordering, searching, summarizing, etc.

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

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.

Copies part of array within.

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

Parse postgres array columns

Remove duplicate values from an array. Fastest ES5 implementation.

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

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

Sort the keys of an object

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 without duplicates

Create an array by repeating the given value n times.

Recursively flatten an array or arrays.

Map `visit` over an array of objects.

Returns independent copy of a passed array

Copy values from one complex single-precision floating-point vector to another complex single-precision floating-point vector.

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

Copy values from one complex double-precision floating-point vector to another complex double-precision floating-point vector.

Isomorphic, functional type-checking for Javascript

Turn anything into an array

List of text file extensions

Guarantees an array back

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

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

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

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.

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

A Node-RED node to copy array data obtained from influxdb out node and display it on FlowFuse Dashboard 2.0

Simple to use (Angular) component for viewing text, such as JSON and arrays, with a 'copy to clipboard' option.

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.

Push items to an array at their correct sort-position

Typescript-compatible minimalistic shallow equality check for arrays/objects

Check if two arrays are equal

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

Microsoft sucks

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.

No-bullshit super-simple es7 collections shim for Array#includes, Object.values, Object.entries

Run an array of functions in series

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

Get the last or last n elements in an 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()`.

Validates if a value is an integer array.

A order-map collection in the form of key, value, that ensures the index.

Validates if a value is 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

Faster alternative to javascript's native filter method.

Computes the greatest common divisor (gcd).

Array#filter for older browsers.

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.

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

Computes the least common multiple (lcm).

An optionally-asynchronous forEach with an interesting interface.

Convert a string to utf8 byte array or vice versa.

Treat multiple buffers as one

Iterates over the elements in an array, returning an array with only the elements for which the callback returns truthy.

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

Sort array elements in descending order.

filter in array tree

Sort the keys in an object.

Sort array elements in ascending order.

Simple ES6 Array.prototype.findIndex polyfill for older environments.

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.

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

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

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

Make any value an array. No dependencies.

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

Multidimensional Arrays

Microsoft sucks

Watch an object or array for changes

Create an immutable clone or copy of data. This could be an array, object, map, set or function.

Generates an array of consecutive integers starting at 0

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

Make array iteration easy when using async/await and Promises

`[].reduce()` for old browsers

Check whether a value is "empty".

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

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

Safely push each item of an array to a stream

Sort an array on an object property

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

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

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Test if a value is a Float64Array.

Float32Array.

Return a data type from a string representing the type

Float64Array.

Test if a value is a Uint32Array.

Maximum unsigned 32-bit integer.

Deep-merge the values of one object structure into another

Test if a value is a Uint8Array.

Uint8Array.

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 a Uint16Array.

Packs an array-of-arrays into a single ndarray

Test if a value is a Float32Array.

Initialize an array of arrays to a constant

Uint16Array.

Uint32Array.

Given an array, shuffles a cloned copy, and returns it. (Fisher–Yates method)

Rotate all items in an array

Rearrange array elements by index array

flattens nested vertex data into a typed array

Find [nd-]array min/max values

Convert Buffer to ArrayBuffer

creates a new array with given range

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

Copies part of array to another.

Simple iterator for flat and multi section lists

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

Move an array item to a different position

List of getter/setter properties for JavaScript types

List of properties for JavaScript objects

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.

List of JavaScript types

Shuffle and unshuffle an array by seed/key.

Copies missing properties to the target object.

Makes easy to convert JSON to CSV

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

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

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

Array / Arraylike utilities

Uniquely flexible and light-weight utility for cloning and deep (recursive) merging of JavaScript objects. Supports descriptor values, accessor functions, and custom prototypes. Provides advanced options for customizing the clone/merge process.

Rotate an array by a given number of steps

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.

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

Chai plugin for JSON Schema v4

Merge two lists, trying to preserve the order of both

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

Extensible deep value equivalence checking for any data types

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

Return true if the given number is even.

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

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

Functional tree editing, manipulation & navigation

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

Recursively iterates over arrays and objects

Flatten a nested array.

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

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.

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

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

Module for working with CIDR (v4, v6)

List of common default router IP addresses

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

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