Basic asynchronous programming is a fundamental concept in JavaScript that allows you to perform tasks without blocking the execution of other code. Asynchronous operations are particularly useful when dealing with tasks that take time, such as fetching data from a server, reading files, or making network requests. One of the primary ways to handle asynchronous…
In JavaScript, scope refers to the context in which variables, functions, and objects are accessible and can be referenced. It defines the visibility and lifetime of these entities within your code. Understanding scope is crucial for managing variables, preventing naming conflicts, and writing maintainable and error-free code. JavaScript has two main types of scope: Example:…
How Node.js works with its event loop and non-blocking I/O, let’s break down the process step by step: Event Loop: Non-Blocking I/O: By combining the event loop and non-blocking I/O, Node.js can handle multiple tasks concurrently without waiting for any single task to complete. This approach is particularly effective in scenarios where an application needs…
Node.js is an open-source, server-side, runtime environment built on Chrome’s V8 JavaScript engine. It allows you to run JavaScript code outside of a web browser, enabling you to build various types of applications, such as web servers, networking tools, command-line utilities, and more. Node.js is designed to be efficient and non-blocking, making it particularly well-suited…
Parameter De-structuring: Parameter de-structuring allows you to unpack properties of objects passed as function arguments into local variables within the function body. This can make code more readable and eliminate the need for multiple property accesses. type ABC = { a: number; b: number; c: number }; function sum({ a, b, c }: ABC) {console.log(a…
Rest Arguments: The rest parameter syntax allows you to pass a variable number of arguments to a function. This is useful when you want to handle multiple arguments without explicitly listing them. The spread syntax is used to pass multiple values from an iterable (like an array) as individual arguments to a function. const arr1…
Functions: are the primary means of passing data around in JavaScript. TypeScript allows you to specify the types of both the input and output values of functions.enabling better type checking and code clarity.Function Declaration: You can declare a function using the function keyword. You can specify parameter types and the return type using type annotations.…
TypeScript is to be a static typechecker for JavaScript programs – in other words, a tool that runs before your code runs (static) and ensures that the types of the program are correct (typechecked). Arrays: Arrays in TypeScript are similar to arrays in JavaScript, but with the added benefit of type annotations and type inference.…
Type Coercion:- Type coercion, also known as type conversion, refers to the process of automatic or implicit conversion of values from one data type to another. This is often necessary when performing operations involving values of different types. Type coercion can be either explicit or implicit. For example, in JavaScript: var x = 5; var y =…
Closures:- Since a nested function is a closure, this means that a nested function can “inherit” the arguments and variables of its containing function. In other words, the inner function contains the scope of the outer function. The closures can contain multiple scopes; they recursively contain the scope of the functions containing it. This is…
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