JavaScript Certification Study Topic: Understand Hoisting in JavaScript

Understand "Hoisting" in JavaScript is important and at the same time somewhat misleading. In this video, I will cover the Hoisting concept. This is a process that happens while the JavaScript engine interprets the written JavaScript code.

JavaScript engine always interprets the JavaScript code within the Global Execution context which comes with two phases - compilation and execution.

During the compilation phase, JavaScript will parse the written code to find out all functions and variable declarations. When found, it will allocate space in memory for each of the declared variables. This is what knows as "Hoisting".

So "Hoisting" is a process of moving variable and function declarations to the top of the scope. This creates the illusion of "moving at the top of their scope", but in reality, the JavaScript engine will store the declared variables and functions in memory even before the rest of the code try to refer to them.

During the execution phase, the JavaScript engine will assign values to the variables and start processing functions.

Based on the discussion above where I have explained how JavaScript codes are being interpreted, all variable and functions are lifted to the top of their functional/local or global scope regardless of there where they are declared. This is what known as "Hoisting".

Blog: https://www.sudipta-deb.in/2021/06/understand-hoisting-in-javascript.html

Video: https://youtu.be/zpR2zT-AlGE

Note - I am sharing all my JavaScript Certification study notes below. Please provide your feedback if you see anything wrong or missing. Appreciate your help.

https://www.sudipta-deb.in/p/salesforce-javascript-developer-i-study.html

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