JavaScript Code Execution — Jay Tillu

JavaScript Code Execution — Simplified

JavaScript executes code in two phases:

1. Memory Creation Phase (Variable Setup):

• This is where JavaScript gets ready to work.
• It sets up space in memory for things like variables and functions.
• Variables are prepared but don’t have values yet; they are like empty boxes.
• Functions are stored in memory with all their instructions, like a recipe.

2. Code Execution Phase (Doing the Work):

• Now, JavaScript starts doing the actual tasks in your code.
• It works one step at a time, following the order of your code.
• When it sees a variable, it gives it a value.
• If there’s a function, it runs that function like a small program.
• After the function finishes, the result is saved, and the function’s stuff is removed.

Think of it like making a list of what you need to do (Memory Creation Phase) and then actually doing each task one by one (Code Execution Phase). When you have a recipe (function), you follow the steps in the recipe, and when you’re done, you put away the recipe and keep the dish you made.

Jai Hind, Vande Mataram 🇮🇳

Sounds too complicated? Read the Simplified Versions

• Pass by Value & Pass by Reference — Simplified
• JavaScript Code Execution — Simplified
• React Element — Simplified

Read more about React & JavaScript

• Understanding Callbacks in JavaScript
• Call Stack in JavaScript
• What is React
• Datatypes in JavaScript
• Variables in JavaScript
• Scope in JavaScript
• Hoisting in JavaScript
• Working of JavaScript

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