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.

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.

Return a partial object copy excluding specified keys.

Return a partial object copy containing only specified keys.

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

returns a copy of an array with falsey values removed

Object/Array shallow copy

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

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

Remove elements from a copy of an 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.

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().

Determines if an object can be used as an array

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

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

Copies part of array to another.

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

Return a shallow copy of a portion of an array.

Copy values from x into y.

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.

Copies part of array within.

Copies part of array to another.

Removes duplicates from a sorted array in place

Copies part of array to another.

Copies part of array within.

Copies part of array within.

Returns independent copy of a passed array

Get the first fulfilled promise that satisfies the provided testing function

Array#isArray for older browsers

Get the first path that exists on disk of multiple paths

Get the native type of a value.

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`

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

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.

User-friendly glob matching

Minimal async jobs utility library, with streams support

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.

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.

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

Is this value a JS SharedArrayBuffer?

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

List of binary file extensions

Is this value a JS ArrayBuffer?

Robustly get the byte length of a Typed Array

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

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

Flatten nested arrays

Robustly get the byte offset of a Typed Array

ES spec-compliant shim for ArrayBuffer.prototype.slice

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

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.

The swiss army knife for binary data in JavaScript.

extend like a boss

A list of SPDX license identifiers

Robustly get the length of a Typed Array

Detect whether or not an object is a Typed Array

Convert a value to an array

Remove circular references from objects

Copies part of array within.

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

Simply swizzle your arguments

TypedArray polyfill for old browsers

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

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

Array manipulation, ordering, searching, summarizing, etc.

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

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.

Parse postgres array columns

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

Remove duplicate values from an array. Fastest ES5 implementation.

a few common utility template tags for ES2015

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.

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.

Create an array by repeating the given value n times.

Recursively flatten an array or arrays.

Map `visit` over an array of objects.

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

Iterator abstraction based on ES6 specification

Create an array without duplicates

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

Guarantees an array back

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

Isomorphic, functional type-checking for Javascript

List of text file extensions

ES2015 `Array#findIndex()` ponyfill

Join paths and globs.

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

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

Copies part of array to another.

Like an array, but rounder.

Get the longest item in an array.

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

Replace or remove multiple items in an array.

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

Check if two arrays are equal

returns a shuffled copy of an array

A package that returns a deep copy of a given object or array

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

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.

Microsoft sucks

Concatenate a readable stream's data into a single array

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

List of Markdown file extensions

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

Push items to an array at their correct sort-position

ES spec-compliant shim for TypedArray.prototype.slice

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

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Run an array of functions in series

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.

Array#filter for older browsers.

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

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

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

Validates if a value is an array.

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

Computes the least common multiple (lcm).

Validates if a value is an integer array.

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

Computes the greatest common divisor (gcd).

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

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

Get the last or last n elements in an array.

An optionally-asynchronous forEach with an interesting interface.

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

Faster alternative to javascript's native filter method.

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

Immutable Array.prototype.copyWithin().

Sort array elements in descending order.

Treat multiple buffers as one

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.

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.

filter in array tree

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

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

`[].reduce()` for old browsers

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

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

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

Make any value an array. No dependencies.

Watch an object or array for changes

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)

Convert a string to utf8 byte array or vice versa.

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

Return a shallow copy of a portion of an array.

Multidimensional Arrays

Make array iteration easy when using async/await and Promises

Microsoft sucks

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

Check whether a value is "empty".

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

Generates an array of consecutive integers starting at 0

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

Sort an array on an object property

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

Convert Buffer to ArrayBuffer

Safely push each item of an array to a stream

Uint32Array.

Uint16Array.

Test if a value is a Float32Array.

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

Float64Array.

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

Packs an array-of-arrays into a single ndarray

Maximum unsigned 32-bit integer.

Test if a value is a Uint8Array.

Uint8Array.

Test if a value is a Uint16Array.

Test if a value is an array.

Test if a value is a Float64Array.

Float32Array.

Return a data type from a string representing the type

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

Test if a value is a Uint32Array.

Reuse typed arrays

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

Rotate all items in an array

creates a new array with given range

Move an array item to a different position

Find [nd-]array min/max values

Deep-merge the values of one object structure into another

Initialize an array of arrays to a constant

Simple iterator for flat and multi section lists

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

Rearrange array elements by index array

List of JavaScript types

List of properties for JavaScript objects

flattens nested vertex data into a typed array

List of getter/setter properties for JavaScript types

Merge two lists, trying to preserve the order of both

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

Copies missing properties to the target object.

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

Chai plugin for JSON Schema v4

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

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

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.

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

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

Computes the cosine similarity between two arrays.

Sort string index ranges

Computes the dot product between two numeric arrays.

Makes easy to convert JSON to CSV

recursive object extending & overriding

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

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

Array / Arraylike utilities

Extensible deep value equivalence checking for any data types

Functional tree editing, manipulation & navigation

Recursively iterates over arrays and objects

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

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

Shuffle and unshuffle an array by seed/key.

Randomize the order of the elements in a given array.

Creates a real Array from almost anything.

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.

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

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

A utility function to index arrays by any criteria

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