gistfile1.txt

addFoo(e, target_variable){
    if(e.target.checked){
    this.setState({
      show: [...this.state.show, target_variable]})
    }else{
      var index = this.state.show.indexOf('target_variable');
      if (index > -1) {
      this.state.show.splice(index, 1);
      this.setState({
        show: [...this.state.show,]})
      }
    }
  }


addBooks(e){
    addFoo(e, 'books');
 }


addMovies(e){
  addFoo(e, 'movies');
 }