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Basic JavaScript

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JavaScript Advanced

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This section covers advanced function topics in JavaScript.

These chapters are best after you understand basic functions (calling, parameters, return values, expressions, and arrows).

Note

If you are not comfortable with basic functions yet, start here:

JavaScript Functions Tutorial

Advanced Functions Learning Path

Core Concepts

Step 1

Function Context and the this Keyword

Understand how this is decided by how a function is called.

Advanced


Step 2

Closures: Functions Remember Their Scope

Learn how functions can remember variables after the outer function finishes.

Advanced


Control & Patterns

call(): Set this and pass arguments

Call a function with a chosen this value.

Advanced


Step 4

apply(): Like call(), but arguments as an array

Use apply() when you already have an array of values.

Advanced


Step 5

bind(): Create a new function with fixed this

Use bind() when you need a function to run later with the same this.

Advanced

Step 6

Function References and Callbacks

Pass functions as values and avoid common callback mistakes.

Advanced


Quick Start

Advanced Quiz

Ready to test your knowledge?
Try the advanced quiz (it builds on the basic quiz).

JavaScript Advanced Functions Quiz

Tip: Advanced functions are easier when you reuse the same examples.
This section uses person, greet, and counter across multiple chapters.



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