FAQ: Vue Data - Watchers

This community-built FAQ covers the “Watchers” exercise from the lesson “Vue Data”.

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Good Morning.
How can I decide when I have to use ‘watch’ propierties? I’ve understood that I’ve have to prefer ‘computed propierties’ whenever I can, but is there any specific rule that I can use to decide the best moments for ‘watch’ propierties? Thank you.

There isn’t a fixed rule. If you use a watcher, and you notice you simple update the array (for a list view for example), you are better of using computed property

i recently used vue data tables, i had to update the amount entries in the table, i used a watcher (given i need to set an integer on a specific variable). I couldn’t use computed for this.

so i think the rule of thumb is to use computed properties, unless you can’t. Then used watch.

With time, you will gain experience in this, and being able to decide which is best in what you want to do

1 Like

Thank you.
Michele R.

In this example, instead of using:

  watch: {
    specialRequests: function(newRequests, oldRequests) {
      if (newRequests.toLowerCase().includes('meet and greet') || newRequests.toLowerCase().includes('meet-and-greet')) {
       this.ticketType = 'vip';

could you not use

specialRequests: {
      set: function(newRequests) {
        if (newRequests.toLowerCase().includes('meet and greet') || newRequests.toLowerCase().includes('meet-and-greet')) {
          this.ticketType = 'vip';

within computed:?

(I tried it and it didn’t work, but I don’t understand why)