What is the default binding of "this" in JavaScript?
- Global object
- Parent object
- Undefined
- Null
The default binding of "this" in JavaScript is the global object. In most cases, when "this" is not explicitly set or bound to an object, it defaults to the global object (e.g., "window" in browsers). This behavior can lead to unexpected results, so it's crucial to be aware of it and handle "this" appropriately in your code.
What was the original name of JavaScript?
- ECMAScript
- JScript
- Java
- LiveScript
JavaScript was originally called "LiveScript" when it was first introduced in Netscape Navigator 2.0 in September 1995. However, it was quickly renamed to "JavaScript" to capitalize on the popularity of Sun Microsystem's Java language.
The "super" keyword in JavaScript is used to call methods on a parent class, and it should be called within the constructor method of the child class, before using the "this" keyword, otherwise it will result in a reference error, stating that "this is not _________.
- Defined
- Valid
- a Function
- Accessible
The "super" keyword in JavaScript is used to call methods on a parent class within the constructor method of the child class. If it is not called before using the "this" keyword, it will result in a reference error, stating that "this is not a function." This highlights the importance of calling "super" before accessing the properties and methods of the parent class.
The _________ event does not necessarily have to be attached to a form element.
- submit
- reset
- change
- keydown
The change event in JavaScript doesn't necessarily have to be attached to a form element. It can also be used with other HTML elements like ,