JSPM

Get the native type of a value.

Isomorphic, functional type-checking for Javascript

Return a data type from a string representing the type

Type checking for JSON values

Blazing fast, tree-shakeable, type-safe, modern utility library to sort any type of array in less than 1 KB!

Return the data type of an array.

Bind data arrays to any type of JS objects

Perform data joins with any type of JS objects

The Type Conversion Library. Numbers, Strings, Arrays, Maps, Objects, and Iterators.

Test if an input value is a supported ndarray data type.

Return the data type string associated with an ndarray data type enumeration constant.

Return the data type string associated with a supported ndarray data type value.

Determines the underlying data type of an input value.

Returns an array constructor corresponding to an array data type.

Returns an array constructor corresponding to an array data type.

Casts an array to an array of a different data type.

Returns an array data type corresponding to an array constructor name.

Determine if an ndarray data type can be safely cast to another ndarray data type.

Returns an array data type corresponding to an array constructor name.

Improved type check

Return the single letter character abbreviation for an underlying array data type.

Determine if an ndarray data type can be cast to another ndarray data type according to a specified casting mode.

Return the enumeration constant associated with an ndarray data type string.

Common types, type guards and type checkers.

Fix the type definition of `Array.isArray()` method to accept readonly arrays

Return the number of bytes per element provided an underlying array data type.

Determine if an ndarray data type can be safely cast to, or is of the same kind as, another ndarray data type.

Check if a value is an array or a typed array

Reliable dynamic type checking

Enforce schema on JavaScript objects, including type, transformation, and validation. Supports extends, sub-schemas, and arrays.

Test if an input value is a supported array boolean data type.

Determine if an ndarray data type can be safely cast or, for floating-point data types, downcast to another ndarray data type.

Type-safe array sorting method with support for deeply nested properties and Typescript autocompletion.

Test if an input value is a supported array complex-valued floating-point data type.

Filter an array or arguments by JavaScript native type (e.g. functions, strings, etc).

Return the data type of a provided ndarray.

Return the data type of a provided ndarray.

Test if an input value is a supported array real-valued data type.

Get the first path that exists on disk of multiple paths

Test if an input value is a supported ndarray real-valued data type.

Test if an input value is a supported ndarray integer data type.

Returns `true` if a value is any type of object, but not an array. Browserify-ready.

Test if an input value is a supported array signed integer data type.

A type-safe collection of comparison methods for objects and arrays in TypeScript/JavaScript

Test if an input value is a supported ndarray numeric data type.

Test if an input value is a supported ndarray floating-point data type.

Better 'typeof'. Detects real type of the objects like 'Array()', 'new Number(1)', 'new Boolean(true)', etc.

Test if an input value is a supported ndarray complex-valued floating-point data type.

Test if an input value is a supported ndarray unsigned integer data type.

Test if an input value is a supported ndarray signed integer data type.

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

Return the data type of an ndarray data buffer.

Get the first fulfilled promise that satisfies the provided testing function

Type checking utils.

Test if an input value is a supported array real-valued floating-point data type.

A type-safe groupBy function for TypeScript

Determines if an object can be used as an array

List of output ndarray data type policies.

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

[](https://npmjs.org/package/fastify-type-provider-zod) [](https://npmjs.org/package/fastify-type-provid

Test if an input value is a supported ndarray real-valued floating-point data type.

Extended JavaScript Type Validator

Array#isArray for older browsers

A simple, type-safe way to create multi-dimensional arrays

Type-safe utilities to return a random element from an array or random entry from an object

User-friendly glob matching

Determine the minimum array data type for storing a provided signed integer value.

retrieve the type of your value by using constructors when possible

Return the data type string associated with a strided array data type enumeration constant.

> The repository for _high quality_ TypeScript type definitions.

Resolve the output ndarray data type for a unary function.

> Type-safe CLI library with no runtime dependencies

Safely get/set deep nested properties with standard path, strong type support

Simply swizzle your arguments

Comprehensive utility library providing commonly used functions for JavaScript/TypeScript projects including array processing, object manipulation, Promise handling, and type checking

Determine the minimum array data type of the closest kind necessary for storing a provided scalar value.

Validates if a value is an array.

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

A list of SPDX license identifiers

Parse postgres array columns

extend like a boss

Return the enumeration constant associated with a supported ndarray data type value.

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

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

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

Return the data type string associated with a supported strided array data type value.

Remove duplicate values from an array. Fastest ES5 implementation.

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

Type checker for JS

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

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

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

A comprehensive TypeScript/JavaScript type checking library providing functions to check data types, collections, primitives, and built-in objects

Takes any JavaScript data type or object as an input and returns a string describing the type of the input.

Map `visit` over an array of objects.

Type checking for json objects

ES2015 `Array#findIndex()` ponyfill

Array methods for ES6 Iterators

Removes duplicates from a sorted array in place

Creates a shallow clone of any JavaScript value.

Return the enumeration constant associated with a strided array data type string.

flattens nested vertex data into a typed array

Concatenate a readable stream's data into a single array

Array#filter for older browsers.

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

A tiny and type-safe TypeScript utility to create and work with fixed-length arrays (tuples).

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

Determine if an array data type can be safely cast to another array data type.

Recursively flatten an array or arrays.

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

Get a compare function for array to sort

Utils for working with JavaScript classes and prototype methods.

Determine if an array data type can be safely cast or, for floating-point data types, downcast to another array data type.

A TypeScript utility library focused on deep operations for objects and arrays with full type safety. Similar to Lodash, but narrower in scope and fully written in TypeScript to maximize typing support.

make a shallow copy of an object or array

Turn anything into an array

Iterator abstraction based on ES6 specification

An optionally-asynchronous forEach with an interesting interface.

Return the C data type associated with a provided data type value.

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

Array with sorted insertion and optimized search methods.

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.

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

Safely push each item of an array to a stream

Microsoft sucks

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`

Validates if a value is an integer array.

Tiny queue data structure

Computes the greatest common divisor (gcd).

Test if an input value is a supported ndarray boolean data type.

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.

Computes the least common multiple (lcm).

Minimal async jobs utility library, with streams support

Get the longest item in an array.

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

Like an array, but rounder.

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

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

the array type info object.

List of binary file extensions

Typescript-compatible minimalistic shallow equality check for arrays/objects

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

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

Flatten nested arrays

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

Robustly get the byte length of a Typed Array

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

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

Is this value a JS SharedArrayBuffer?

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

Is this value a JS ArrayBuffer?

ES spec-compliant shim for ArrayBuffer.prototype.slice

Rearrange array elements by index array

A simple list of possible Typed Array names.

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

Initialize an array of arrays to a constant

Robustly get the byte offset of a Typed Array

Robustly get the length of a Typed Array

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

creates a new array with given range

Move an array item to a different position

Convert a value to an array

Deep copy objects and arrays

Make array iteration easy when using async/await and Promises

Multidimensional Arrays

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.

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

TypedArray polyfill for old browsers

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

Array manipulation, ordering, searching, summarizing, etc.

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

Reuse typed arrays

Get the last or last n elements in an array.

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

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

Packs an array-of-arrays into a single ndarray

Faster alternative to javascript's native filter method.

`array-filter-utils` is a library offering a bulk of functions to filter arrays with type management.

Microsoft sucks

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

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

Combines a list of arrays, returning a single array with unique values, using strict equality for comparisons.

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.

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

Lazily initialized properties for objects

Type casting component

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

Test if a value is an array.

a few common utility template tags for ES2015

Test if a value is a Float64Array.

Test if a value is a Uint32Array.

Test if a value is a Uint8Array.

Sort array elements in descending order.

Test if a value is a Uint16Array.

Test if a value is a Float32Array.

Sort array elements in ascending order.

Sort the keys of an object

The swiss army knife for binary data in JavaScript.

Find [nd-]array min/max values

Tests a value’s type against a string like 'positive integer' or 'non-empty map'.

Sort the keys in an object.

Return the enumeration constant associated with a supported strided array data type value.

Create an array without duplicates

Create an array by repeating the given value n times.

Module for working with CIDR (v4, v6)

Return the description for a provided data type.

Make any value an array. No dependencies.

List of getter/setter properties for JavaScript types

List of properties for JavaScript objects

List of JavaScript types

Check if a string matches the name of a Node.js builtin module

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

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.

Generates an array of consecutive integers starting at 0

Computes the dot product between two numeric arrays.

Check whether a value is "empty".

Guarantees an array back

Execute a method out from an object.

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

List of text file extensions

List of common default router IP addresses

Convert base64/datauri/plain string to ArrayBuffer

`[].reduce()` for old browsers

A utility function to index arrays by any criteria

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

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

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

Join paths and globs.

0-dependency, high-performance, reactive event handling library optimized for both browser and Node.js environments. This library introduces a robust and type-safe abstraction for handling events, reducing boilerplate and increasing code maintainability.

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

0-dependency, high-performance, reactive event handling library optimized for both browser and Node.js environments. This library introduces a robust and type-safe abstraction for handling events, reducing boilerplate and increasing code maintainability.

Sparse array implementation in JS with no dependencies

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

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

Find the intersection of two arrays

Returns an array filled with the specified input

Circular fixed size array

Return the data type string associated with a provided single letter abbreviation.

Rotate all items in an array

Asynchronous iterator function for parallel processing.

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

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

Array / Arraylike utilities

Convert any binary data to ArrayBuffer

Extensible deep value equivalence checking for any data types

Create an error from an array of error messages