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get-object-class

v1.0.2

Published

Get the class type of any object

Downloads

4

Readme

get-object-class

A more explicit improvement on typeof

Installation

$ npm i get-object-class --save

Usage

// ES2015
import goc from 'get-object-class';

// CommonJS
const goc = require('get-object-class');

// script
const goc = window.getObjectClass;

Implementation

const array = [];
const promise = Promise.resolve();

console.log(goc(array)); // array
console.log(goc(promise)); // promise

Why do we need this?

Generally speaking, you can use the typeof operator to determine a number of object classes:

  • boolean
  • function
  • number
  • object
  • string
  • symbol
  • undefined

However, this list is quite limited, and things can get confusing for other classes of objects:

console.log(typeof new Date()); // object
console.log(typeof null); // object

This library rectifies that by giving you the specific object class for any object (if I missed one tell me, I'll add it):

  • Arguments => arguments
  • Array => array
  • ArrayBuffer => arraybuffer
  • Boolean => boolean
  • DataView => dataview
  • Date => date
  • Error => error
  • Float32Array => float32array
  • Float64Array => float64array
  • Function => function
  • GeneratorFunction => generatorfunction
  • global => global (specific to node)
  • Int8Array => int8array
  • Int16Array => int16array
  • Int32Array => int32array
  • JSON => json (tests the JSON object itself, not if the value is a valid JSON string)
  • Map => map
  • Math => math
  • Null => null
  • Number => number
  • Object => object
  • Promise => promise
  • RegExp => regexp
  • Set => set
  • String => string
  • Symbol => symbol
  • Uint8Array => uint8array
  • Uint8ClampedArray => uint8Clampedarray
  • Uint16Array => uint16array
  • Uint32Array => uint32array
  • WeakMap => weakmap
  • WeakSet => weakset
  • Window => window (specific to browser)

Checker functions

get-object-class also provides a checker function for each object class, example:

const array = [];
const boolean = true;

console.log(goc.isArray(array)); // true
console.log(goc.isBoolean(array)); // false

Keep in mind that the name of the function is driven by the PascalCase names in the list above:

const regexp = /foo/;

console.log(goc.isRegExp(regexp)); // true
console.log(goc.isFloat32Array(regexp)); // false
console.log(goc.isJSON(regexp)); // false

Development

Standard stuff, clone the repo and npm i to get the dependencies. npm scripts available:

  • build => builds the distributed JS with NODE_ENV=development and with sourcemaps
  • build-minified => builds the distributed JS with NODE_ENV=production and minified
  • compile-for-publish => runs the lint, test, transpile, build, and build-minified scripts
  • dev => runs the webpack dev server for the playground
  • lint => runs ESLint against files in the src folder
  • prepublish => if in publish, runs compile-for-publish
  • test => run ava with NODE_ENV=test
  • test:watch => runs test but with persistent watcher
  • transpile => runs Babel against files in src to files in lib