Component API

Question 1

setState()

Answer 1

Triggers UI update. Does a shallow merge of new state into old

params: nextState[, callback]

• nextState
  function(prevState, props) or object
• callback
  called after setState is completed and component is rerendered

Question 2

forceUpdate()

Answer 2

Force rerender even if setState() hasn’t been called. This is used for non-pure components (which use things other than this.props and this.state)

params: [callback]