Why Don\'t Arrow Functions Work as Expected in Vue Computed Properties?

Arrow Functions in Vue Computed Properties

Problem:

Using arrow functions in Vue computed properties can cause unexpected behavior. After changing the methods in a computed property to arrow functions, the DOM elements' colors do not change, even though the underlying data values still switch successfully.

Answer:

This issue arises because arrow functions do not bind this to the Vue instance within which the computed property is defined. This behavior is consistent with other contexts where arrow functions are used, such as in instance methods.

As per the Vue documentation:

"Don't use arrow functions on an instance property or callback (e.g. vm.$watch('a', newVal => this.myMethod())). As arrow functions are bound to the parent context, this will not be the Vue instance as you'd expect and this.myMethod() will be undefined."

Resolution:

To resolve this issue, avoid using arrow functions in computed properties or instance methods. Instead, use traditional function syntax (e.g., function() { ... }) to correctly bind this to the Vue instance.

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