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.

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

Returns an array constructor corresponding to an array 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.

Common types, type guards and type checkers.

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

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

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

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

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

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.

Return the data type of a provided ndarray.

Return the data type of a provided ndarray.

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

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 integer data type.

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

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 array signed integer 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.

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

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

Extended JavaScript Type Validator

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

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

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

User-friendly glob matching

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

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

Simply swizzle your arguments

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

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.

extend like a boss

A list of SPDX license identifiers

Parse postgres array columns

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

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

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

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

Removes duplicates from a sorted array in place

Array methods for ES6 Iterators

Creates a shallow clone of any JavaScript value.

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.

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

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

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

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

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.

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

Array with sorted insertion and optimized search methods.

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

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

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

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

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`

Microsoft sucks

Validates if a value is an integer array.

Tiny queue data structure

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).

Computes the greatest common divisor (gcd).

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

Like an array, but rounder.

Minimal async jobs utility library, with streams support

Get the longest item in an array.

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

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

Typescript-compatible minimalistic shallow equality check for arrays/objects

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

the array type info object.

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

Flatten nested arrays

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

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

A simple list of possible Typed Array names.

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?

Robustly get the length of a Typed Array

Initialize an array of arrays to a constant

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

ES spec-compliant shim for ArrayBuffer.prototype.slice

Robustly get the byte offset of a Typed Array

Rearrange array elements by index array

creates a new array with given range

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

Move an array item to a different position

Convert a value to an array

Multidimensional Arrays

Make array iteration easy when using async/await and Promises

Detect whether or not an object is a Typed Array

Deep copy objects and arrays

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

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

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

Array manipulation, ordering, searching, summarizing, etc.

TypedArray polyfill for old browsers

Reuse typed arrays

Get the last or last n elements in an array.

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

Packs an array-of-arrays into a single ndarray

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

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

Faster alternative to javascript's native filter method.

Microsoft sucks

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

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.

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.

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

Lazily initialized properties for objects

a few common utility template tags for ES2015

Test if a value is an array.

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 Float32Array.

Test if a value is a Uint16Array.

Sort array elements in ascending order.

Sort the keys of an object

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

The swiss army knife for binary data in JavaScript.

Find [nd-]array min/max values

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

Sort the keys in an object.

Create an array without duplicates

Module for working with CIDR (v4, v6)

Create an array by repeating the given value n times.

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

Generates an array of consecutive integers starting at 0

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

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

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.

Computes the dot product between two numeric arrays.

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.

Execute a method out from an object.

Check whether a value is "empty".

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

List of common default router IP addresses

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

`[].reduce()` for old browsers

Convert base64/datauri/plain string to ArrayBuffer

A utility function to index arrays by any criteria

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.

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

Rotate all items in an array

Asynchronous iterator function for parallel processing.

Array / Arraylike utilities

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

Convert any binary data to ArrayBuffer

Create an error from an array of error messages

Extensible deep value equivalence checking for any data types

Convert Gitignore to Glob patterns