using the watch method to monitor route updates in vue

                                    watch: {
  movie(movie) {
    // Fetch data about the movie
    fetch(`/${movie}`).then((data) => {
      this.movieData = data;
    });
  }
}

                                    export default {
  name: 'MovieData',
  props: {
    movie: {
      type: String,
      required: true,
    }
  },
  data() {
    return {
      movieData: {},
    }
  },

  watch: {
    // Whenever the movie prop changes, fetch new data
    movie(movie) {
      // Fetch data about the movie
      fetch(`/${movie}`).then((data) => {
        this.movieData = data;
      });
    }
  }
}

                                    export default {
  name: 'ColourChange',
  props: {
    colours: {
      type: Array,
      required: true,
    },
  },
  watch: {
    colours: {
      // This will let Vue know to look inside the array
      deep: true,

      // We have to move our method to a handler field
      handler()
        console.log('The list of colours has changed!');
      }
    }
  }
}

                                    watch: {
  // Whenever the movie prop changes, fetch new data
  movie {
    handler: 'fetchData'
  },
  // Whenever the actor changes, we'll call the same method
  actor: {
    handler: 'fetchData',
  }
},

methods: {
  // Fetch data about the movie
  fetchData() {
    fetch(`/${this.movie}/${this.actor}`).then((data) => {
      this.movieData = data;
    });
  }
}

                                    watch: {
  // Whenever the movie prop changes, fetch new data
  movie: {
    // Will fire as soon as the component is created
    immediate: true,
    handler(movie) {
      // Fetch data about the movie
      fetch(`/${movie}`).then((data) => {
        this.movieData = data;
      });
    }
  }
}