Array Methods (forEach, map, filter, and reduce) - Day 17

In this video, we learn the most important and frequently asked JavaScript array methods:

* forEach()
* map()
* filter()
* reduce()

These methods are widely used in:

• JavaScript interviews
• Real-world projects
• Modern frontend development
• Data transformation and manipulation

You will understand:

* How forEach works and why it does not return a value
* How map transforms elements and returns a new array
* How filter selects specific elements
* How reduce combines values into a single result
* The difference between map and forEach (very common interview question)
* Real interview-style example (cart total calculation)

All examples are written using modern arrow functions so you learn industry-standard syntax.

If you master these four methods, your understanding of JavaScript arrays becomes much stronger.

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#MapFilterReduce
#ForEach
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#arrowfunctions

Видео Array Methods (forEach, map, filter, and reduce) - Day 17 канала PersistenceCode