JavaScript -
JavaScript is a high-level programming language used to create interactive web pages and web
applications.
It is a client-side scripting language, meaning that it runs on the user's web browser, rather than on a
web server.
Data types in JavaScript -
JavaScript has seven data types: string, number, boolean, null, undefined, object, and symbol.
Difference between null and undefined -
Null is an intentional absence of any object value, while undefined means that a variable has been
declared but has not yet been assigned a value.
DOM -
The Document Object Model (DOM) is a programming interface for web documents. It represents the
page so that programs can change the document structure, style, and content.
Closure -
A closure is a function that has access to variables in its outer (enclosing) scope, even after the outer
function has returned.
Difference between let and var -
Var is function-scoped, while let is block-scoped. This means that variables declared with var can be
accessed within the entire function, while variables declared with let are only accessible within the block
they are declared in.
Event bubbling in JavaScript -
Event bubbling is a mechanism in which events propagate up the DOM tree from the target element to
its ancestors. This means that if you click on a child element, the click event will be triggered on all of its
ancestors as well.
Callback Function -
A callback function is a function passed as an argument to another function, which is then invoked
inside the outer function to complete some kind of action or process.
Arrow Functions -
Arrow functions are a shorthand syntax for creating anonymous functions in JavaScript. They have a
more concise syntax than traditional function declarations and automatically bind to the surrounding
context, making it easier to write functional code.
AJAX -
AJAX stands for Asynchronous JavaScript and XML. It is a technique used to send and receive data
from a server without reloading the entire page. This allows web pages to be more dynamic and
responsive.
Promises -
Promises are objects that represent the eventual completion or failure of an asynchronous operation
and its resulting value. They allow you to write asynchronous code that looks synchronous, making it
easier to manage complex operations.
Hoisting -
Hoisting is a behavior in JavaScript where variable declarations and function declarations are moved to
JavaScript is a high-level programming language used to create interactive web pages and web
applications.
It is a client-side scripting language, meaning that it runs on the user's web browser, rather than on a
web server.
Data types in JavaScript -
JavaScript has seven data types: string, number, boolean, null, undefined, object, and symbol.
Difference between null and undefined -
Null is an intentional absence of any object value, while undefined means that a variable has been
declared but has not yet been assigned a value.
DOM -
The Document Object Model (DOM) is a programming interface for web documents. It represents the
page so that programs can change the document structure, style, and content.
Closure -
A closure is a function that has access to variables in its outer (enclosing) scope, even after the outer
function has returned.
Difference between let and var -
Var is function-scoped, while let is block-scoped. This means that variables declared with var can be
accessed within the entire function, while variables declared with let are only accessible within the block
they are declared in.
Event bubbling in JavaScript -
Event bubbling is a mechanism in which events propagate up the DOM tree from the target element to
its ancestors. This means that if you click on a child element, the click event will be triggered on all of its
ancestors as well.
Callback Function -
A callback function is a function passed as an argument to another function, which is then invoked
inside the outer function to complete some kind of action or process.
Arrow Functions -
Arrow functions are a shorthand syntax for creating anonymous functions in JavaScript. They have a
more concise syntax than traditional function declarations and automatically bind to the surrounding
context, making it easier to write functional code.
AJAX -
AJAX stands for Asynchronous JavaScript and XML. It is a technique used to send and receive data
from a server without reloading the entire page. This allows web pages to be more dynamic and
responsive.
Promises -
Promises are objects that represent the eventual completion or failure of an asynchronous operation
and its resulting value. They allow you to write asynchronous code that looks synchronous, making it
easier to manage complex operations.
Hoisting -
Hoisting is a behavior in JavaScript where variable declarations and function declarations are moved to
