Feeling puzzled by the code snippet for vuejs-templates using webpack-simple?

Just starting out with javascript.

Learning Vue.js through example reading.

But feeling confused by the code snippet from vuejs-templates/webpack-simple.

Specifically line 25

  data () {
    return {
      msg: 'Welcome to Your Vue.js App'
    }
  }

Questioning why the code can't be written like this

  data: () => {
    return {
      msg: 'Welcome to Your Vue.js App'
    }
  }

I've experimented with both codes, but got the same result.

The information in the Vue.js documentation wasn't clear to me.

If anyone could explain this code snippet, that would be greatly appreciated.

Thank you for taking the time to read about my issue.

Answer №1

The focus here is not on explaining why it isn't, but rather on discussing why it should.

In both scenarios, you are creating a function within an object literal. In the world of es6, there exists the concept of method properties, which serve as a concise notation method. For more information, refer to MDN.

Answer №2

It's important to proceed with caution when utilizing arrow functions instead of method properties.

Arrow functions introduce the concept of lexical this, which can sometimes lead to confusion if it does not refer to the intended context (such as the Vue object but may end up pointing to a parent object like the window).

The VueJS documentation also issues a similar warning:

Avoid using arrow functions for instance properties or callbacks (e.g. vm.$watch('a', newVal => this.myMethod())). Since arrow functions bind to the parent context, this will not be referencing the Vue instance as you might anticipate, resulting in this.myMethod being undefined.

Learn more about Properties and Methods in Vue.js from the official documentation.

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