"foo" instanceof String //=> false "foo" instanceof Object //=> false true instanceof Boolean //=> false true instanceof Object //=> false false instanceof Boolean //=> false false instanceof Object //=> false  //...

The instanceof keyword in JavaScript can be quite confusing when it is first encountered, as people tend to think that JavaScript is not an object-oriented programming language.   What is it? What problems does it solve? When is it appropriate and...

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...

Is there anyway to detect if a JavaScript object is a regex?  For example, I would like to do something like this:  var t = /^foo(bar)?$/i; alert(typeof t); //I want this to return "regexp"   Is this possible?  Thanks!  EDIT: Thanks for all t...

I'm writing a simple platform game using javascript and html5.  I'm using javascript in an OO manner.  To get inheritance working i'm using the following;  // http://www.sitepoint.com/blogs/2006/01/17/javascript-inheritance/ function copy...

I'm trying to use some of the more advanced OO features of Javascript, following Doug Crawford's "super constructor" pattern. However, I don't know how to set and get types from my objects using Javascript's native type system...

I'm reading through the code of the class-validator library and it has the following isInstance method in it:  /**  * Checks if the value is an instance of the specified object.  */ isInstance(object: any, targetTypeConstructor: new (...args: any...

I was playing around with instanceof in Chrome but I got an error message. I think I know why (you have to supply a function after the instanceof keyword that is the constructor the object was created with), but the error message seems to be stating...

Today I happened to have too much time to kill and I played a bit with the Node (v0.10.13) command line:  > 1 instanceof Object false > (1).__proto__ {} > (1).__proto__ instanceof Object true > (1).__proto__.__proto__ === Object.prototype...

This is a really basic question really just to satisfy my curiosity, but is there a way to do something like this:  if(obj !instanceof Array) {     //The object is not an instance of Array } else {     //The object is an instance of Array }   The key...