What are some examples of Vue's reactivity system?

Can you explain Vue's reactivity system with some examples?

Sure! Vue's reactivity system allows you to create dynamic user interfaces by automatically updating the DOM when data changes. For example, if you have a data property called 'count', and you bind it to a template, any changes to 'count' will automatically reflect in the UI.

Can you give me a code example of how that works?

Absolutely! Here's a simple example:

new Vue({
  el: '#app',
  data: {
    count: 0
  },
  template: `<div>{{ count }}</div>`
});

In this example, when you update 'count', the displayed value in the div will update automatically.

What happens if I have a nested object in my data?

Good question! Vue can also react to changes in nested objects, but you need to use Vue.set() to ensure reactivity. For example:

this.$set(this.nestedObject, 'newProperty', value);

Are there any performance considerations I should be aware of?

Yes, when dealing with large data sets or complex nested structures, it's important to minimize unnecessary reactivity. You can use computed properties or watchers to optimize performance.