object - Read For Learn

AttributeError: ” object has no attribute ”

Your NewsFeed class instance n doesn’t have a Canvas attribute. If you want to pass the Canvas defined in your Achtergrond class instance hoofdscherm to n, you can define it under the class definition for NewsFeed using __init__(): Then when you initialize your NewsFeed object as n, you can pass the Canvas instance from your Achtergrond class instance hoofdscherm: This is a solution to your current issue, but there are other errors in your code that you can see … Read more

PHP Fatal error: Using $this when not in object context

In my index.php I’m loading maybe foobarfunc() like this: but can also be You can not invoke method this way because it is not static method. You should instead use: If however you have created a static method something like: then you can use this:

How to iterate over a JavaScript object?

For most objects, use for .. in : With ES6, if you need both keys and values simultaneously, do To avoid logging inherited properties, check with hasOwnProperty : You don’t need to check hasOwnProperty when iterating on keys if you’re using a simple object (for example one you made yourself with {}). This MDN documentation explains more generally how to deal with objects … Read more

Creating a static class with no instances

The Pythonic way to create a static class is simply to declare those methods outside of a class (Java uses classes both for objects and for grouping related functions, but Python modules are sufficient for grouping related functions that do not require any object instance). However, if you insist on making a method at the … Read more

TypeScript Objects as Dictionary types as in C#

In newer versions of typescript you can use: In older versions you can use: You can also make an interface if you don’t want to type that whole type annotation out every time:

Array of JSON Objects

I am trying to re-implement a page using JSON instead of some 2-dimensional arrays. What I am hoping to accomplish is get an array of objects. The objects would look like this: I want to create an array of these restaurant objects and populate the distance field with some logic, then sort the array based … Read more

What does [object Object] mean?

The default conversion from an object to string is “[object Object]”. As you are dealing with jQuery objects, you might want to do to print the element’s ID. As mentioned in the comments, you should use the tools included in browsers like Firefox or Chrome to introspect objects by doing console.log(whichIsVisible()) instead of alert. Sidenote: … Read more

Saving and loading objects and using pickle

I´m trying to save and load objects using pickle module.First I declare my objects: After that I open a file called ‘Fruits.obj'(previously I created a new .txt file and I renamed ‘Fruits.obj’): After do this I close my session and I began a new one and I put the next (trying to access to the … Read more

What is property in hasOwnProperty in JavaScript?

hasOwnProperty returns a boolean value indicating whether the object on which you are calling it has a property with the name of the argument. For example: However, it does not look at the prototype chain of the object. It’s useful to use it when you enumerate the properties of an object with the for…in construct. … Read more

How can I access and process nested objects, arrays or JSON?

Preliminaries JavaScript has only one data type which can contain multiple values: Object. An Array is a special form of object. (Plain) Objects have the form Arrays have the form Both arrays and objects expose a key -> value structure. Keys in an array must be numeric, whereas any string can be used as key … Read more

+ More