"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...
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