JavaScript · Senior · Question 52 of 75

What do iterator helpers like `map.values().filter(...).take(3)` give you?

✓Correct answer: Lazy, chainable operations on any iterator without first materializing an array
2Faster array methods
3Parallel iteration on multiple threads

Explanation

Iterator.prototype gained map, filter, take, drop, flatMap, reduce, toArray and more. They process items on demand, so take(3) on a huge or infinite generator stops early.

What do iterator helpers like `map.values().filter(...).take(3)` give you?

Explanation

Further reading

Problem with a question

Test yourself

What do iterator helpers like map.values().filter(...).take(3) give you?

Explanation

Further reading

Test yourself

What do iterator helpers like `map.values().filter(...).take(3)` give you?