p5.js-web-editor/client/modules/IDE/reducers/ide.js

import * as ActionTypes from '../../../constants';

const initialState = {
  isPlaying: false
};

const ide = (state = initialState, action) => {
  switch (action.type) {
    case ActionTypes.TOGGLE_SKETCH:
      return {
        isPlaying: !state.isPlaying
      };
    case ActionTypes.START_SKETCH:
      return {
        isPlaying: true
      };
    case ActionTypes.STOP_SKETCH:
      return {
        isPlaying: false
      };
    default:
      return state;
  }
};

export default ide;