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.

Return a partial object copy excluding specified keys.

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

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

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.

Remove elements from a copy of an array

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.

Utils for working with JavaScript classes and prototype methods.

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

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

Determines if an object can be used as an array

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

Tiny queue data structure

User-friendly glob matching

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`

Run an array of functions in parallel

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.

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

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

List of binary file extensions

Is this value a JS ArrayBuffer?

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

Is this value a JS SharedArrayBuffer?

Flatten nested arrays

ES spec-compliant shim for ArrayBuffer.prototype.slice

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.

Robustly get the byte offset 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.

A simple list of possible Typed Array names.

extend like a boss

Return a shallow copy of a portion of an array.

Robustly get the length of a Typed Array

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

Convert a value to an array

Remove circular references from objects

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.

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

Array manipulation, ordering, searching, summarizing, etc.

TypedArray polyfill for old browsers

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

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

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

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

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

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 few common utility template tags for ES2015

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

Create an array by repeating the given value n times.

Recursively flatten an array or arrays.

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.

Iterator abstraction based on ES6 specification

Map `visit` over an array of objects.

Create an array without duplicates

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.

Get a compare function for array to sort

Guarantees an array back

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

Isomorphic, functional type-checking for Javascript

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

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

List of text file extensions

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

ES2015 `Array#findIndex()` ponyfill

Join paths and globs.

Like an array, but rounder.

Array methods for ES6 Iterators

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

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

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.

Replace or remove multiple items in an array.

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

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

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.

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

Push items to an array at their correct sort-position

Typescript-compatible minimalistic shallow equality check for arrays/objects

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

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

Microsoft sucks

ES spec-compliant shim for TypedArray.prototype.slice

Concatenate a readable stream's data into a single array

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.

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

Run an array of functions in series

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

Get the last or last n elements in an array.

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

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

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.

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

Validates if a value is an integer array.

Array#filter for older browsers.

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

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

Faster alternative to javascript's native filter method.

Computes the greatest common divisor (gcd).

Computes the least common multiple (lcm).

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

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

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

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.

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

filter in array tree

Convert a string to utf8 byte array or vice versa.

Treat multiple buffers as one

Sort the keys in an object.

Sort array elements in descending order.

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

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.

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

`[].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)

Microsoft sucks

Multidimensional Arrays

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

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

Check whether a value is "empty".

Maximum unsigned 32-bit integer.

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

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

Float64Array.

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

Test if a value is a Uint8Array.

Safely push each item of an array to a stream

Test if a value is a Uint16Array.

Uint8Array.

Test if a value is a Float64Array.

Float32Array.

Sort an array on an object property

Test if a value is a Uint32Array.

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

Uint32Array.

Uint16Array.

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.

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

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

Convert Buffer to ArrayBuffer

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

Move an array item to a different position

Find [nd-]array min/max values

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

Simple iterator for flat and multi section lists

List of getter/setter properties for JavaScript types

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

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

Rotate an array by a given number of steps

Copies missing properties to the target object.

Makes easy to convert JSON to CSV

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.

Shuffle and unshuffle an array by seed/key.

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

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

Array / Arraylike utilities

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.

Creates a real Array from almost anything.

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

Returns independent copy of a passed array

Functional tree editing, manipulation & navigation

Computes the dot product between two numeric arrays.

Computes the cosine similarity between two arrays.

Chai plugin for JSON Schema v4

Extensible deep value equivalence checking for any data types

Merge two lists, trying to preserve the order of both

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

Return true if the given number is even.

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

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

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.

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.

List of common default router IP addresses

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.

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.