Iteration Patterns
Map, filter, reduce as common loop shapes.
Lesson 3
Concept
Many tasks fit patterns: map transforms each item; filter keeps some items; reduce folds many values into one. Prefer built-ins where idiomatic.
Try it
Order the steps to filter even numbers
These steps are out of order — can you fix them?
1.Check if divisible by 2
2.Iterate items
3.Return result list
4.Keep passing items