JavaScript Generator

Generators in JavaScript are special functions that can pause and resume execution.
They are useful when you want to produce values one at a time instead of all at once.

Generators are commonly used for:

• Controlled iteration

• Working with large data

• Lazy evaluation

• Custom data streams

What Are Generators in JavaScript?

A generator function:

• Is defined using function*

• Uses yield to return values

• Returns an iterator object

• Can pause its execution and continue later

Creating a Generator Function

Explanation:

• function* defines a generator

• yield sends a value and pauses execution

• next() resumes execution

• When values end, done becomes true

Using Generators with for...of

• for...of works with generators

• Each yield provides the next value

• Loop stops automatically when done

Generator with Dynamic Logic

• Generator controls the flow

• Values are produced on demand

• Useful for ranges, pagination, streams

Real-World Example: Paginated Data

Why Generators Are Important

Understanding JavaScript generators helps you:

• Build custom iterators

• Process large data efficiently

• Control execution flow

• Improve performance with lazy evaluation

• Write cleaner iteration logic

Quick Summary

• function* creates a generator

• yield returns values step by step

• next() resumes execution

• Generators return iterators

• Works with for...of

Conclusion

Generators in JavaScript provide a powerful way to control iteration and execution flow.
They allow you to work with data lazily and efficiently, making them ideal for modern JavaScript applications.