While exploring the Vue.js documentation, I came across two ways to define data: data: {} and data() { return; }.
data: {
defaultLayout: 'default'
}
data() {
return {
defaultLayout: 'default'
}
}
However, there is a third way that I am not familiar with yet: data: () => ({}). I wonder how it differs from the first two methods.
data: () => ({
defaultLayout: 'default'
})
Out of the two examples provided, only the second one is considered valid. It is important to avoid using arrow functions for data as it changes the context of this to global, making it impossible to reference anything from the Vue instance.
data: () => ({
someValue = 'default',
defaultLayout: this.someValue //!!undefined!!!
})
The correct way to define data:
data() {
return {
defaultLayout: 'default'
}
}
When working inside an object literal,
data() {
return {
defaultLayout: 'default'
}
}
you can use a shorthand method by writing it like this:
data: function() {
return {
defaultLayout: 'default'
}
}
Alternatively, you have the option to use an arrow function as well:
data: () => ({
defaultLayout: 'default'
})
Arrow functions serve as shortcuts for returning values. Consider the following code snippet:
() => "aaa"
This will result in the string "aaa" being returned. Essentially, there is an implicit return statement in arrow functions. Exploring further, let's examine:
data: () => ({
defaultLayout: 'default'
})
This will yield an object with a property called "defaultLayout". Now, compare this to your initial code snippet:
data() {
return {
defaultLayout: 'default'
}
}
which is equivalent to:
data: function() {
return {
defaultLayout: 'default'
}
}
The second and third examples are nearly identical, but the distinction lies in the fact that arrow functions have lexical binding of "this".
Your original sample represents a less favorable coding practice. You can learn more about it here.
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