How to use Vue function in v-bind:value="foo(number)"?

Question

Vue.js

Hello, I want to set the input to the default value that is processed by the function - how to do this
examplev-bind:value="foo(number)"

Answer 1

hang watcher

Answer 2

watcher is a bad idea, try to make a computed property (computed) and pass it to :value="someComputedFunction"
To change you can subscribe to the @Input event, implement a function and change some state mediocre there
Although ideally see your case, what is required