gistfile1.txt

DEFAULT_INTERVAL = 5000; //ms

class MyComponent extends React.Component {
  state = {
    interval: DEFAULT_INTERVAL
    timeoutId = setTimeout(DEFAULT_INTERVAL, someApiFunction),
  };
  constructor(props) {
    super(props);
    this.onIntervalChange = this.onIntervalChange.bind(this);
  }  
  onIntervalChange(val) {
     cancelTimeout(this.state.timeoutId);
     this.setState({
       interval: val,
       timeoutId = setTimeout(DEFAULT_INTERVAL, someApiFunction),
     });
  }
}