precise-typeof

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

compression	size
precise-typeof.js	1.69 kB
precise-typeof.min.js	809 B
precise-typeof.min.js.gz	391 B

Install

$ yarn add precise-typeof

or

$ npm install --save precise-typeof

Examples

var typeOf = require('precise-typeof');

typeOf({});               // -> 'object'
typeOf(new function(){}); // -> 'object'
typeOf([]);               // -> 'array'
typeOf(25);               // -> 'number'
typeOf(Infinity);         // -> 'number'
typeOf('ABC');            // -> 'string'
typeOf(function(){});     // -> 'function'
typeOf(Math.sin);         // -> 'function'
typeOf(undefined);        // -> 'undefined'
typeOf(true);             // -> 'boolean'
typeOf(null);             // -> 'null'
typeOf(NaN);              // -> 'nan'

// object values
typeOf(new Object());                           // -> 'object'
typeOf(new Array());                            // -> 'array'
typeOf(new Number(5));                          // -> 'number'
typeOf(new Number(Infinity));                   // -> 'number'
typeOf(new String('ABC'));                      // -> 'string'
typeOf(new Function('a', 'b', 'return a + b')); // -> 'function'
typeOf(new Boolean());                          // -> 'boolean'
typeOf(new Number('blabla'));                   // -> 'nan'

// instances
typeOf(new function Moment(){});                // -> 'object'

// special objects
typeOf(/s/);         // -> 'regexp'
typeOf(new Date());  // -> 'date'
typeOf(Math);        // -> 'math'
typeOf(new Error()); // -> 'error'
typeOf(arguments);   // -> 'arguments'

// node
typeOf(global);               // -> 'global'
typeOf(process);              // -> 'process'
typeOf(Buffer('B'));          // -> 'buffer'
typeOf(new Buffer(2));        // -> 'buffer'
typeOf(Buffer([62, 64, 66])); // -> 'buffer'

// es6
typeOf(Symbol('A')); // -> 'symbol'

// browser
typeOf(window);                                   // -> 'global'
typeOf(document);                                 // -> 'html'
typeOf(document.body);                            // -> 'html'
typeOf(document.getElementsByTagName('html')[0]); // -> 'html'
typeOf(document.getElementsByTagName('div'));     // -> 'html'
typeOf(document.createElement('a'));              // -> 'html'
typeOf(document.createTextNode('Abcd'));          // -> 'text'
typeOf(document.createComment('abcd'));           // -> 'comment'
typeOf(document.createEvent('Event'));            // -> 'event'
typeOf(document.createEvent('UIEvents'));         // -> 'event'
typeOf(document.createEvent('HTMLEvents'));       // -> 'event'
typeOf(document.createEvent('MouseEvents'));      // -> 'event'

{ pojoOnly: true }

With pojoOnly flag it only reports Plain-Old Javascript Objects as object, and reports "instances" by their constructor names (e.g. Moment for moment instance). In case if object was created from the nameless function, it will be reported as unknown.

var typeOf = require('precise-typeof');

// reported differently with `{pojoOnly: true}`
typeOf(new function Moment(){}, {pojoOnly: true}); // -> 'Moment'
typeOf(new function ABC(){}, {pojoOnly: true});    // -> 'ABC'
typeOf(new function(){}, {pojoOnly: true});        // -> 'unknown'

// same with or without `{pojoOnly: true}`
typeOf({}, {pojoOnly: true});                      // -> 'object'
typeOf([], {pojoOnly: true});                      // -> 'array'
typeOf(25, {pojoOnly: true});                      // -> 'number'
typeOf(Infinity, {pojoOnly: true});                // -> 'number'
typeOf('ABC', {pojoOnly: true});                   // -> 'string'
typeOf(function(){}, {pojoOnly: true});            // -> 'function'
typeOf(Math.sin, {pojoOnly: true});                // -> 'function'
typeOf(undefined, {pojoOnly: true});               // -> 'undefined'
typeOf(true, {pojoOnly: true});                    // -> 'boolean'
typeOf(null, {pojoOnly: true});                    // -> 'null'
typeOf(NaN, {pojoOnly: true});                     // -> 'nan'

typeOf(new Object(), {pojoOnly: true});            // -> 'object'
typeOf(new Array(), {pojoOnly: true});             // -> 'array'
typeOf(new Number(5), {pojoOnly: true});           // -> 'number'
typeOf(new Number(Infinity), {pojoOnly: true});    // -> 'number'
typeOf(new String('ABC'), {pojoOnly: true});       // -> 'string'
typeOf(new Function(), {pojoOnly: true});          // -> 'function'
typeOf(new Boolean(), {pojoOnly: true});           // -> 'boolean'
typeOf(new Number('blabla'), {pojoOnly: true});    // -> 'nan'

License

Precise-TypeOf is released under the MIT license.