When you use for item in o for some iterable object o, Python calls iter(o) and expects an iterator object as the return value. An iterator is any object which implements a next (or next in Python 2) method and an iter method. By convention, the iter method of an iterator should return the object itself (i.e. return self).
Since you have not yet said what to point to, Java sets it to null. In the second line, the new keyword is used to instantiate (or create) an object of type Integer, and the reference variable num is assigned to that Integer object. If you attempt to dereference num before creating the object you get a NullPointerException.
and Object objects! stringify({}) -> [object Object] That's because the constructor function is called Object (with a capital "O"), and the term "object" (with small "o") refers to the structural nature of the thingy. Usually, when you're talking about "objects" in Javascript, you actually mean " Object objects ", and not the other types.
One of my alerts is giving the following result: [object Object] What does this mean exactly? (This was an alert of some jQuery object.)
Here I'm creating a JavaScript object and converting it to a JSON string, but JSON.stringify returns " [object Object]" in this case, instead of displaying the contents of the object.
I am receiving this error and I'm not sure what it means? Object reference not set to an instance of an object.
What does "Object reference not set to an instance of an object" mean ...
4 You can check whether object contains an attribute by using the hasattr built-in method. For an instance, if your object is a and you want to check for attribute stuff: