Javascript Beginner To Advanced Concepts

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Day 1: Introduction to JavaScript

JavaScript

  • A high-level, interpreted programming language used to add interactivity and dynamic behavior to web pages.

Variables

  • Containers for storing data values.

Data Types

  • Types of values in JavaScript: numbers, strings, booleans, objects, etc.

Operators

  • Symbols used to perform operations on variables and values.

Functions

  • Blocks of code that can be defined once and executed multiple times.

Day 2: Control Flow and Conditionals

Conditional Statements

  • if, else if, and else statements for executing different code blocks based on different conditions.

Comparison Operators

  • Symbols used to compare values, such as ==, ===, !=, !==, <, >, <=, >=.

Logical Operators

  • Symbols used to combine conditional statements, such as &&, ||, !.

Ternary Operator

  • Shorthand for writing conditional statements in a single line.

Day 3: Loops and Iteration

for Loop

  • Executes a block of code a specified number of times.

While Loop

  • Executes a block of code while a specified condition is true.

do...while Loop

  • Similar to the while loop, but the block of code is executed at least once before the condition is tested.

for...in Loop

  • Iterates over the properties of an object.

for...of Loop

  • Iterates over the values of an iterable object like arrays or strings.

Day 4: Arrays and Objects

Arrays

  • Ordered collections of values, accessed by numeric indices.

Array Methods

  • Functions that manipulate array contents: push(), pop(), shift(), unshift(), splice(), slice(), etc.

Objects

  • Collections of key-value pairs, with values accessed by keys.

Object Methods

  • Functions that are properties of objects.

Day 5: Functions and Scope

Function Declarations

  • Defining functions using the function keyword.

Function Expressions

  • Defining functions as expressions, often assigned to variables.

Arrow Functions

  • A more concise syntax for writing functions.

Scope

  • The context in which variables are declared and accessed.

Global Scope

  • Variables declared outside of any function, accessible throughout the entire program.

Local Scope

  • Variables declared within a function, accessible only within that function.

Day 6: DOM Manipulation

DOM (Document Object Model)

  • A programming interface for web documents, representing the structure of an HTML document as a tree of objects.

Selecting Elements

  • Methods like getElementById(), getElementsByClassName(), getElementsByTagName(), querySelector(), and querySelectorAll().

Modifying Elements

  • Methods like innerHTML, textContent, setAttribute(), classList, etc.

Creating and Removing Elements

  • Methods like createElement(), appendChild(), removeChild(), etc.

Day 7: Event Handling

Events

  • Actions that occur as a result of user interactions or other triggers.

Event Handlers

  • Functions executed when a specific event occurs.

Event Listeners

  • Methods like addEventListener() to attach event handlers to elements.

Event Object

  • An object containing information about the event, passed to event handler functions as an argument.

Event Propagation

  • The order in which event handlers are executed: capturing phase or bubbling phase.

Event Delegation

  • Technique for handling events on multiple elements with a single event handler.

Day 8: Asynchronous JavaScript

Callbacks

  • Functions passed as arguments to other functions and executed later.

Promises

  • Objects representing the eventual completion or failure of an asynchronous operation.

async/await

  • Keywords used with asynchronous functions to write asynchronous code in a synchronous style.

XHR (XMLHttpRequest)

  • Object used to interact with servers and make HTTP requests from web browsers.

Fetch API

  • Modern alternative to XHR for making HTTP requests in JavaScript.

AJAX (Asynchronous JavaScript and XML)

  • Technique for updating parts of a web page without reloading the whole page.

Day 9: ES6 and Modern JavaScript

ES6 (ECMAScript 2015)

  • Major update to the JavaScript language, introducing new syntax and features.

Arrow Functions

  • A more concise syntax for writing functions.

Template Literals

  • Strings that allow embedded expressions.

Destructuring Assignment

  • Extracting values from arrays or objects and assigning them to variables.

Spread Operator

  • Expands an iterable (like an array) into individual elements.

Classes & Inheritance

  • Prototypal inheritance in JavaScript using class syntax.

Modules

  • Encapsulating code into reusable modules using import and export statements.

Day 10: Advanced JavaScript Concepts

Closures

  • Functions that remember the scope in which they were created, even after that scope has closed.

Prototypes and Prototypal Inheritance

  • The mechanism by which JavaScript objects inherit features from one another.

Context (this)

  • A reference to the object that owns the currently executing code.

Execution Context and Hoisting

  • The context in which JavaScript code is executed and the process of moving variable and function declarations to the top of their containing scope.

Event Loop

  • The mechanism that allows JavaScript to perform non-blocking operations.

Memory Management

  • How JavaScript manages memory allocation and deallocation, including garbage collection.

Day 11 & 12: Functional Programming & Advanced JS

Functional Programming

  • A programming paradigm focused on building software by composing pure functions and avoiding shared state, mutable data, and side effects.

Pure Functions

  • Functions that return the same output for the same input and do not produce side effects.

Immutability

  • The principle that data should not be changed after it is created.

Higher-Order Functions

  • Functions that take other functions as arguments or return functions.

Map, Filter, & Reduce

  • Higher-order functions commonly used in functional programming for transforming and aggregating data.

Recursion

  • A technique where a function calls itself to solve smaller instances of the same problem.

Module Patterns

  • Techniques for encapsulating and organizing code into modules.

Singleton Pattern

  • A design pattern that restricts the instantiation of a class to a single instance.

Observer Pattern

  • A design pattern where an object, called the subject, maintains a list of its dependents, called observers, and notifies them of any state changes.

Promises & Async/Await Patterns

  • Patterns for managing asynchronous code and handling asynchronous operations in JavaScript.

Memoization

  • A technique of storing the results of expensive function calls and returning the cached result when the same inputs occur again.


FAQs

What is JavaScript used for?

  • JavaScript is used to add interactivity and dynamic behavior to web pages.

What are the data types in JavaScript?

  • Numbers, strings, booleans, objects, etc.

How do you declare a variable in JavaScript?

  • Using var, let, or const.

What is a closure in JavaScript?

  • A function that remembers the scope in which it was created, even after that scope has closed.

How does the event loop work in JavaScript?

  • It allows JavaScript to perform non-blocking operations by managing asynchronous tasks.

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