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Determine if the JS environment has Symbol support. Supports spec, or shams.
Determine if the JS environment has BigInt support.
Type check values
Returns true if an object was created by the `Object` constructor, or Object.create(null).
Get the native type of a value.
Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.
Improved typeof detection for node.js and the browser.
Returns true if the value is an object and not an array or null.
Function argument validation for humans
- type
- types
- check
- checking
- guard
- guards
- assert
- assertion
- predicate
- predicates
- is
- validate
- validation
- utility
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Checks whether provided parameter looks like a number
A simple utility to Check the value is number or can convert to a number, for example string ' 123 ' can be converted to 123.
A vanilla JavaScript library for checking the type of variables in a more robust and accurate way than the typeof operator
- vanilla javascript
- types
- type
- type checking
- type checking library
- type checking module
- true type checking
- typeof
- typeof library
- typeof module
- typeof checking
- typeOf
- isString
- isNumber
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Type assertions aka less-broken `typeof`
- jest
- task
- querystring
- airbnb
- hasOwnProperty
- hasOwn
- es2015
- Array.prototype.flatMap
- cors
- watchFile
- input
- make
- protocol-buffers
- Uint16Array
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- in
- ECMAScript 2020
- extra
- tslib
- $.extend
- matchAll
- predictable
- gradients css3
- eslintconfig
- eslintplugin
- status
- stringifier
- iterator
- native
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A more type-sensitive typeof, make type detection easier
Deprecated. Utilities for ES3, most of which have been adopted or superseded in ES5.1. Adapted from Douglas Crockford's Remedial JavaScript