Checking if a key exists in a JavaScript object??

How do I check if a particular key exists in a JavaScript object or array? If a key doesn't exist, and I try to acc...

Checking if a key exists in a JavaScript object??

How do I check if a particular key exists in a JavaScript object or array? If a key doesn't exist, and I try to acc...

PHP - undefined offset: 0?

print_r($p->attachments) produces: Array ( [0] => stdClass Object ( [id] => ... ...

super() fails with error: TypeError “argument 1 must be type, not classobj” when parent does not inherit from object?

I get some error that I can't figure out. Any clue what is wrong with my sample code? class B: def meth(self, a...

C++ Reading from file into class object array to print 25 lines?

I am trying to this homework for my c++ class and I have been working on it for a few hours now and am not making an...

Inconsistent Accessibility: Parameter type is less accessible than method?

I'm trying to pass an object (a reference to the currently logged on user, basically) between two forms. At the mom...

2D array Null Pointer Exception error?

public class DoubleMatrix { private double[][] doubMatrix; public DoubleMatrix(int row, int col) { ...

Java - object cannot be resolved (to a variable)?

At first sorry if not everything is understandable (I'm from Germany). And please try to understand that I'm quite n...

Call to non-static member function without an object argument?

Can anyone explain this error any why I am getting it? I believe I've got all of the arithmetic down in my separate ...

Cash Dispense logic - Java?

Let's say I have the following in ArrayList of Currency like this: (But NOT in the order). Each Currency object has ...

Getting index of an array's element based on its properties?

I have a JavaScript array of objects like this: var myArray = [{...}, {...}, {...}]; Each object has unique id am...

Undefined method 'to_i' for :Symbol?

RoR novice here, appreciate any help. I have the following error: undefined method `to_i' for :funding_level:Symb...