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Advanced Language Features
Pause here and make sure the main ideas feel clear before moving to the next chapter.
What you should understand now
Move from everyday syntax into the mechanisms used by mature JavaScript codebases.
Map, Set, and keyed collections
Understand map, set, and keyed collections through a focused practical example.
Iterators and generators
Understand iterators and generators through a focused practical example.
Regular expressions and text processing
Understand regular expressions and text processing through a focused practical example.
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Chapter progress
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Before you move on
Use this quick review if anything still feels unclear.
Complete the lessons, pass the exercises, and pass the quiz to unlock the next chapter.