Namaste JavaScript

Namaste JavaScript: A Comprehensive Guide to JavaScript Concepts

• The JavaScript execution context consists of two phases: memory creation phase and code execution phase.
• Functions in JavaScript create a new execution context when invoked, with its own memory creation and code execution phases.
• Variables declared with "var" are hoisted to the top of their scope, while variables declared with "let" and "const" are not hoisted.
• Closures are formed when a function and its outer environment are bundled together, allowing the function to access variables from its outer environment even after the outer function has finished executing.
• First-class functions in JavaScript can be passed as arguments to other functions or returned as results from functions.
• Callback functions are a way to delay the execution of a line of code until a certain condition is met, and can be used to manage dependencies in a codebase.
• Promises are objects that represent the eventual completion or failure of an asynchronous operation, allowing for better management of callbacks and dependencies.
• Promise chaining allows for the output of one promise to be used as input for the next promise in the chain.
• Error handling in promises can be done through the use of the ".catch" method.
• The JavaScript event loop manages the execution of code in a non-blocking way, allowing for asynchronous operations to be performed.
• JavaScript has several built-in methods, such as map, filter, and reduce, for manipulating arrays and performing common tasks.
• Good coding practices include understanding scope and hoisting, avoiding callback hell, and properly handling errors and dependencies.