ne-types

Introduction

ne-types is a small library of functions that can be used in various projects to test the underlying JavaScript class of a type. It uses the technique of calling Object.prototype.toString.call/apply in order to get at this value.

Custom ES6/7 classes that define a Symbol.toStringTag can also be validated/ tested with this suite of tools. For most intents and purposes, this library of functions is ideal if you want more granular and extensible type testing at runtime than typeof can offer by itself.

Functions

• extendsFrom checks to see if an object supplied extends from a parent class or type. extendsFrom({}, Object) for example
• isArray checks to see if an object is of type Array
• isClass checks to see if an object is either a class or function
• isDate checks to see if an object is a Date object
• isFunction checks to see if an object is a Function
• isNativeClassByProps checks to see if a function is a class
• isNativeClassByString checks to see if an obj is either a function or class
• isNull checks to see if an object is explicitly null
• isNumber checks to see if an object is a number or number constant
• isObject checks to see if an object is truly an object
• isOfType checks to see if an object is of another type; i.e. isOfType('asd', String) === true
• isPrimitive checks to see if an object is a primitive; i.e. not a function, object, class, or any other advanced type
• isRegExp checks to see if an object is a regular expression instance
• isString checks to see if an object is truly a string
• isUndefined checks to see if an object is explicitly undefined
• isValue checks to see if a value is neither object nor array
• typeOf checks and returns the class string value of a given object