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Generators

Generators

Section titled “Generators”

Introduction

Section titled “Introduction”

Generators are special functions that can be paused and resumed. They use the function* syntax and the yield keyword to produce sequences lazily.

Learning Objectives

Section titled “Learning Objectives”
  • Write generator functions with function* and yield
  • Understand lazy evaluation
  • Use yield* for delegation
  • Create async generators
  • Use generators for state machines and infinite sequences

Visual Summary

Section titled “Visual Summary”
sequenceDiagram
    participant Code as Caller
    participant Gen as Generator


    Code->>Gen: generator.next()
    Note over Gen: Runs until yield
    Gen->>Code: { value: 1, done: false }


    Code->>Gen: generator.next()
    Note over Gen: Resumes, runs to next yield
    Gen->>Code: { value: 2, done: false }


    Code->>Gen: generator.next()
    Note over Gen: Resumes, function ends
    Gen->>Code: { value: undefined, done: true }

Topics Covered

Section titled “Topics Covered”
TopicDescriptionEst. Time
Generator Functionsfunction*, yield, next()15 min
yieldyield* delegation, passing values15 min
Async Generatorsfor await…of, async generator functions10 min

Prerequisites

Section titled “Prerequisites”
  • Iterators and the iteration protocol
  • Functions and execution context
  • Async/await basics

Learning Path

Section titled “Learning Path”
Generator Functions → yield → Async Generators
Section titled “Related Topics”