25 окт. 2011 г. · The JavaScript specification gives exactly one proper way to determine the class of an object: Object.prototype.toString.call(t);.

14 дек. 2011 г. · If typeof x === 'object' , x is an object (except a function) or null . If you want null , arrays, and functions to be excluded, ...

19 мая 2017 г. · I'm trying to find a way to pass an object to function in and check it type in a runtime. This is a pseudo code: function func (obj:any) { if( ...

13 мая 2022 г. · I have a JSON file containing two different types of Objects in it. I want to iterate over the JSON with respect to their type.

1 дек. 2008 г. · Using .constructor for type checking will break when you want to check the type of objects coming from different window objects, say that of an ...

14 дек. 2011 г. · This question gives different answers if you are trying to distinguish Arrays (that are Objects) from other Objects or if you are trying to separate scalar ...

3 июл. 2013 г. · The best way is to use the typeof keyword. typeof "hello" // "string" The typeof operator maps an operand to one of eight possible values.

29 мар. 2019 г. · This handy operator gives you the "type" of a Javascript value: typeof 3 // "number" typeof "abc" // "string" typeof {} // "object" typeof true // "boolean"

26 мая 2015 г. · In JS it doesn't seem possible to check if an argument passed to a function is actually of the type 'error' or an instance of Error.

20 янв. 2013 г. · This question is the direct analogon to Class type check in TypeScript. I need to find out at runtime if a variable of type any implements an interface.