Execution Context & Call Stack

How JavaScript Code Executes

JavaScript uses a single-threaded model with an event loop. It executes code in two phases:

1. Creation Phase: Memory allocation for variables and functions.

2. Execution Phase: Runs the code line by line.

Example:

jsCopyEditconsole.log("Start");

function greet() {
    console.log("Hello!");
}

greet();

console.log("End");

✅ Execution Order:

1. "Start" prints.

2. greet() is called, and "Hello!" prints.

3. "End" prints.

🛠 Call Stack Visualization:

• console.log("Start") → Pushed & executed.

• greet() → Pushed, executes console.log("Hello!"), then popped.

• console.log("End") → Pushed & executed.