Mastering Immutable.js

Mapping episodes to elements

The actual side-effect that renders the episode results is similar, but with a few React subtleties. For one thing, the filter() function that composes the filter() iteratee is now a method of the app component:

class App extends React.Component {  filter(query) {    return every(      some(        () => query === undefined,        () => query === '',        every(          () => this.state.title,          v => v.get('title').includes(query)        ),        every(          () => this.state.date,          v => v.get('date').includes(query)        ),        every(          () => this.state.director,          v => v.get('director').includes(query)        )      ),      v => v.get('rating') >= (+this.state.rating)    );  }  ...}

This is necessary because instead of depending on DOM nodes for state, we need to check things such as this.state.director ...