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July 24, 2017 13:20
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Showing the inconsistent behavior and a much better alternative
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| console.log(typeof "foo" === "string"); //true | |
| console.log(typeof String("foo") === "string"); // true | |
| console.log(typeof new String("foo") === "string"); // false | |
| console.log(typeof 1.2 === "number"); //true | |
| console.log(typeof new Date() === "Date"); //false Date is an Object | |
| console.log(typeof [1,2,3] === "array"); //false, an array is on object! | |
| /** Proper way to test type of object **/ | |
| function is(type, obj) { | |
| var clas = Object.prototype.toString.call(obj).slice(8, -1); | |
| return obj !== undefined && obj !== null && clas === type; | |
| } | |
| console.log(is('String', 'test')); // true | |
| console.log(is('String', new String('test'))); // true | |
| console.log(is('Date', new Date())); // true |
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