Nov 12, 2015 · 1 typeof in javascript why it is used? Sometimes you might need to check what kind of data is stored in a variable for example, typeof is an operator not a function and it's …

Feb 16, 2017 · Given everything is an object in Javascript (including arrays, functions & primitive data type objects), I find this behaviour of the typeof operator very inconsistent. Can someone …

19 I'm working on a codecademy.com exercise where we use for-in statements to loop through an object and print hello in different languages by checking to see if the values of the properties in …

In my particular case: callback instanceof Function or typeof callback == "function" does it even matter, what's the difference? Additional Resource: JavaScript-Garden typeof vs instanceof

I can't find any difference between typeof somevar == 'undefined' and typeof somevar === 'undefined', because typeof always returns string. For null it will return 'object'.

Aug 22, 2012 · 109 Since typeof is a compiler extension, there is not really a definition for it, but in the tradition of C it would be an operator, e.g sizeof and _Alignof are also seen as an …

Apr 10, 2015 · I am wondering what the difference is between typeid and typeof in C++. Here's what I know: typeid is mentioned in the documentation for type_info which is defined in the …

Sep 24, 2010 · 25 JS's typeof doesn't always return 'object', but it does return object for things which people may not consider to be objects -- ie arrays, and also, oddly, for nulls. For arrays …

262 Use typeof when you want to get the type at compilation time. Use GetType when you want to get the type at execution time. There are rarely any cases to use is as it does a cast and, in …

typeof [] === typeof null; // is true (both are objects) typeof [] === typeof {}; // is true (both are objects) which is expected behaviour. If you have to specifically check for null, arrays or other …