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restructure behind scenes chapter

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`@@ -5,7 +5,7 @@ description: Understanding Call Stacks in JavaScript`
`5`	`5`	`---`
`6`	`6`
`7`	`7`
`8`		`-## Understanding Call Stacks in JavaScript`
	`8`	`+## Call Stacks in JavaScript`
`9`	`9`
`10`	`10`	`In JavaScript, a Call Stack is a data structure that uses the Last-In, First-Out (LIFO) principle to temporarily store and manage function invocation (call).`
`11`	`11`

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`@@ -4,7 +4,7 @@ pageNumber: 258`
`4`	`4`	`description: Understanding JavaScript Engines and how they execute JavaScript code.`
`5`	`5`	`---`
`6`	`6`
`7`		`-## Understanding JavaScript Engines`
	`7`	`+## JavaScript Engines`
`8`	`8`
`9`	`9`	`A JavaScript engine is a program or an interpreter that executes JavaScript code. The most well-known JavaScript engines are V8 (used in Google Chrome and Node.js), SpiderMonkey (used in Firefox), and JavaScriptCore (used in Safari).`
`10`	`10`

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`@@ -4,7 +4,7 @@ pageNumber: 259`
`4`	`4`	`description: Understanding the Event Loop in JavaScript.`
`5`	`5`	`---`
`6`	`6`
`7`		`-## Understanding the Event Loop in JavaScript`
	`7`	`+## Event Loop in JavaScript`
`8`	`8`
`9`	`9`	`The event loop is a fundamental concept in JavaScript that allows for asynchronous programming. It is responsible for executing code, collecting and processing events, and executing queued sub-tasks.`
`10`	`10`

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`@@ -4,7 +4,7 @@ pageNumber: 260`
`4`	`4`	`description: Understanding Execution Context in JavaScript.`
`5`	`5`	`---`
`6`	`6`
`7`		`-## Understanding Execution Context in JavaScript`
	`7`	`+## Execution Context in JavaScript`
`8`	`8`
`9`	`9`	`In JavaScript, an execution context is an environment where the code is evaluated and executed. It is a fundamental concept that helps manage the scope and behavior of variables and functions.`
`10`	`10`

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`@@ -4,7 +4,7 @@ pageNumber: 261`
`4`	`4`	`description: Understanding Memory Heap in JavaScript.`
`5`	`5`	`---`
`6`	`6`
`7`		`-## Understanding Memory Heap in JavaScript`
	`7`	`+## Memory Heap in JavaScript`
`8`	`8`
`9`	`9`	`In JavaScript, memory management is crucial for ensuring efficient and smooth performance of applications. The memory heap is a region in memory where objects, strings, and closures are stored. It is managed by the JavaScript engine's garbage collector.`
`10`	`10`

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`@@ -4,7 +4,7 @@ pageNumber: 262`
`4`	`4`	`description: Understanding Runtime Environment in JavaScript.`
`5`	`5`	`---`
`6`	`6`
`7`		`-## Understanding Runtime Environment in JavaScript`
	`7`	`+## Runtime Environment in JavaScript`
`8`	`8`
`9`	`9`	`The runtime environment in JavaScript is the context in which your code is executed. It includes the JavaScript engine, the call stack, the memory heap, and the APIs provided by the environment (such as the browser or Node.js).`
`10`	`10`

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