Should Vue.js data properties be accessed directly within a method, or is it better practice to pass them as arguments?

Consider two different scenarios:

Scenario 1:

data(){
    return {
        number: 2
    }
},
methods: {
    multiplyByTwo(number){
        return number*2
    }
},
mounted(){
    this.multiplyByTwo(this.number)
}

Scenario 2:

data(){
    return {
        number: 2
    }
},
methods: {
    multiplyByTwo(){
        return this.number*2
    }
},
mounted(){
    this.multiplyByTwo()
}

In both cases, the function multiplyByTwo calculates the result of multiplying the data's number property by 2. However, in scenario 1, the data number property is passed as an argument to the function, while in scenario 2, the data number property is directly accessed within the function without being passed as an argument.

Now the question arises whether one method is superior to the other. Scenario 2 may be considered less flexible because it relies on the component having a specific data property 'number' for the method to work.

On the other hand, the first scenario allows for more reusability since the number can be passed as an argument, making the method adaptable in various contexts.

Despite acknowledging these differences, I have frequently used scenario 2 in my Vue.js application. Now, I am contemplating whether some methods should be rewritten to ensure better code quality.

Answer №1

Depending on the specific scenario, the approach may vary.

  • If the function does not have any side effects and does not always modify the component's state, then passing the necessary argument is recommended. For instance, if both multiplyByTwo(this.number) and multiplyByTwo(4) are equally probable outcomes.

  • In case the function has side effects and only affects internal state, like in your example, it ultimately boils down to personal judgment. However, choosing a clear and descriptive name can enhance understanding. If I encounter a function named doubleTheCurrentNumber, I wouldn't be surprised if it doesn't require any parameters.

  • If the function consistently works with internal state, there is no need to pass state variables as arguments. Consider the example of insertDocument() which might trigger an API call based on form inputs.

  • For operations that need to be reactive but are not directly called, utilizing a computed property is advisable. An ideal use case for computed properties would be a filtered list.

Answer №2

In my opinion, if you are not altering the value, then they should remain consistent.

For scenarios like this, I suggest utilizing computed properties

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