All challenges
Multiple ChoiceIntermediate 180s

[JavaScript] Array methods Delegation-based inheritance

Where do [].map(), [].filter() come from?
Options
  1. 1Closure
  2. 2Hoisting
  3. 3Prototype chain
  4. 4Event loop

Think you can answer under pressure?

Get matched and answer live questions in 3-minute 1v1 battles. Elo ranking, badge tiers and bragging rights on the line.

Play this in a 3-minute battle