Modern JavaScript rarely writes for loops to process lists. Instead it uses array methods that each do one job and take a small function telling them how.

Method	Gives back
`map`	a new array, every item transformed
`filter`	a new array, only items that pass a test
`reduce`	one single value built from every item
`find`	the first matching item
`some` / `every`	true or false
`forEach`	nothing; it just runs code for each item

They chain together into readable pipelines: enemies.filter(alive).map(toName).join(", ").