By: Rajesh P.S.In JavaScript, null is a primitive value that represents the intentional absence of any object value. It's often used to indicate that a variable or property intentionally holds no value or that an object reference points to nothing. null is a distinct value from undefined ...
JS is the short form for JavaScript. JavaScript or JS is a general-purpose programming language that can be used for web development and server-side development. Popularly JavaScript is referred to as JS. Want to learn coding? Try our new interactive courses. ...
Defines a user-defined enumeration(also known as an enumerated type or enum). An enum is made up of a list of strongly typed, named constants called members. The value of a variable defined as an enum is restricted to the list of members defined for that enum. Is there enum in JavaScript?
This is an optional property, which is actually a literal meaning, a conditional property. Optional Property is just the property name, that is, the question mark after options inoptions?: ?Object,, what does the question mark before the property value type mean, that is,?Object, what does...
JavaScript In the example above, calling the functionsayHellowith thenewkeyword would immediately create a new object that is an instance of the functionsayHello. Thethisbinding inside the function body points to the new object that was created and assigned to the variableme. ...
MEAN is an end-to-end stack of MongoDB, Express.js, AngularJS and Node.js that is gaining popularity in modern web app development.
JavaScript Prototype In JavaScript, you add methods and properties on the prototype property when you want instances of an object to inherit those methods and properties. This is the reason we add the methods on the User.prototype property, so that they can be used by all instances of the Us...
In the history of ECMAScript, we've seen multiple times where the assignment operator wascombinedwith other operators to create shorter expressions of commonly used combinations. In JavaScript, if you want to add5to a variablexyou can shortenx = x + 5tox += 5. ...
Fact checked by Yarilet Perez Definition A variable cost is an expense that changes in proportion to how much a company produces or sells—they rise as production increases and fall as production decreases. What Is a Variable Cost? A variable cost is an expense that changes in proportion to ...
Scripting languages also tend to be loosely typed. This means that avariable's typeis not defined within the code, but is determined at runtime and depends on the variable's value. In addition, a variable's type can sometimes change during the script's execution. For example, the following...