Lexical scope:The Lexical scope is also known asstaticscope which runs in the scope in which they are defined, rather than the scope of execution.The closure is more of Lexical closure with lexical scope. The Lexical closure is a block of code with the data of the context in which this ...
A callback function in JavaScript is a function that is passed as an argument to another function and is invoked after some kind of event.
block indent, in the context of technology and programming, refers to a style of text formatting where each line of the text or code is moved a certain distance from the margin. it's commonly used in coding to make your program easier to read and understand, by visually separating ...
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. ...
One critical strategy in enhancing JavaScript performance isminification. Minification is the process of removing all unnecessary characters from the JavaScript files, such as whitespace, comments, and block delimiters, which helps reduce the amount of data that needs to be transferred over the network...
As with other programming languages, JavaScript uses variables to identify the storage locations of data. Variables may be either global (accessible by any function in the code) or local, also known as block-scoped (accessible only in the block where they are declared). Variables may contain ei...
The script is downloaded to the visitors’ machines and processed there. This differs from a server-side language, in which the server processes the script before sending it to the browser.When encountering a block of JavaScript code, a web browser will process it from top to bottom. Since ...
Then we move out toseven(add). Based on the same function as before, we see that this time a function was indeed passed in. Therefore, the return value is the function addinvoked, with the number7passed in. Finally, add executes using the remembered value of5from its outer scope, and...
The simplest way to handle errors is with a try/catch block. You can wrap your code in this block and then use the catch() method to alert an error if something goes wrong. For example, if you were making a POST request, your code could look like this: ...
Q4: What is the difference between var, let, and const in JavaScript? Ans: var is used to declare a variable with global or function scope, while let and const is used to declare variables with block scope. const variables cannot be re-assigned. Q5: What is a closure in JavaScript? An...