javascript-Core-Concepts

This repository contains daily learning notes, summaries, and practice related to the core fundamentals of JavaScript. It covers essential building blocks like execution context, call stack, scoping, hoisting, and other behind-the-scenes concepts that every serious JavaScript developer must understand.

Purpose

• Daily revision and hands-on practice
• In-depth explanations of how JavaScript actually works
• A growing reference of my personal JavaScript understanding

Topics Covered class-1

• Code Execution
  JavaScript code runs in two phases — memory creation and execution.
• Call Stack
  It manages function calls in a last-in, first-out (LIFO) manner.
• undefined vs is not defined
undefined means declared but not assigned; is not defined means never declared.
• Window Object
  In browsers, window is the global object that holds global variables and functions.
• Variable Scoping
  Scope determines where a variable can be accessed — function or block level.

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💻 Created by Kamran Ikram