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How To Set A Component Non Reactive Data In Vue 2

In Vue.js, managing reactivity is key to building efficient and dynamic applications. One common scenario developers face is needing to set a component's data as non-reactive in Vue 2. While Vue's reactivity system is powerful, there are situations where you may want to prevent reactivity to certain data properties. In this guide, we'll explore how to achieve this in a straightforward manner.

To set a data property as non-reactive in Vue 2, you can make use of `Object.freeze()` method. By freezing an object, you essentially make its properties immutable, thus preventing Vue from tracking changes to those properties. This technique is particularly useful when you have data that should remain constant and not trigger re-renders.

Let's say you have a component with a data property that you want to make non-reactive. Here's an example of how you can achieve this:

Javascript

export default {
  data() {
    return {
      nonReactiveData: Object.freeze({
        key1: 'value1',
        key2: 'value2',
      }),
    };
  },
};

In this snippet, the `nonReactiveData` object is wrapped with `Object.freeze()`, making `key1` and `key2` non-reactive. This means any changes to `key1` or `key2` won't trigger reactivity in the component.

It's important to note that using `Object.freeze()` at the top level doesn't freeze nested objects or arrays within the object. If you need to make nested properties non-reactive as well, you should recursively freeze those nested objects. Here's an example of freezing nested objects:

Javascript

export default {
  data() {
    return {
      nonReactiveData: Object.freeze({
        key1: 'value1',
        nestedObject: Object.freeze({
          keyA: 'valueA',
        }),
      }),
    };
  },
};

In this revised example, both `key1` and the nested object `nestedObject` with `keyA` are made non-reactive by using `Object.freeze()`.

Another approach to setting non-reactive data is by leveraging Vue's computed properties. By using a computed property that returns a copy of the data, you can effectively decouple the reactivity from the original data. This technique works well for more complex data structures that may involve nested objects or arrays.

Javascript

export default {
  data() {
    return {
      reactiveData: {
        key1: 'value1',
        key2: 'value2',
      },
    };
  },
  computed: {
    nonReactiveData() {
      return Object.freeze({ ...this.reactiveData });
    },
  },
};

In this example, `nonReactiveData` is a computed property that returns a frozen copy of `reactiveData`. Any changes to `reactiveData` won't trigger reactivity, ensuring the computed property remains non-reactive.

By utilizing `Object.freeze()` and computed properties in Vue 2, you can effectively handle scenarios where you need to set certain data properties as non-reactive. Whether you're working with simple objects or complex data structures, these techniques provide flexibility in managing reactivity based on your application's requirements.

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