Vue.js Watchers

What is the purpose of computed properties in Vue.js?

• To declaratively compute derived values

• To mutate the DOM

• To change another piece of state based on an async operation

• To handle event bindings

How can we trigger a function whenever a reactive property changes in Vue.js?

• Using computed properties

• Using the watch option

• Using lifecycle hooks

• Using template refs

What is the default behavior of the watch option in Vue.js?

• Lazy callback execution

• Eager callback execution

• Immediate callback execution

• Post-flush callback execution

When should we use a deep watcher in Vue.js?

• When we want the callback to fire on all nested mutations

• When we want to fetch initial data

• When we want to access the DOM after Vue has updated it

• When we want to stop a watcher

How can we force a watcher's callback to be executed immediately in Vue.js?

• By using the immediate: true option

• By using the deep: true option

• By using the flush: 'post' option

• By using the $watch() instance method

What is the flush: 'post' option used for in Vue.js?

• To access the DOM after Vue has updated it

• To fetch initial data

• To stop a watcher

• To conditionally set up a watcher

How can we imperatively create watchers in Vue.js?

• By using the watch option

• By using the $watch() instance method

• By using computed properties

• By using lifecycle hooks

When are watchers automatically stopped in Vue.js?

• When the owner component is unmounted

• When the watcher is no longer needed

• When the DOM is mutated

• When the reactive property changes

What does the $watch() API return in Vue.js?

• A function to stop the watcher

• A function to fetch initial data

• A function to access the DOM after Vue has updated it

• A function to conditionally set up a watcher

What is the purpose of the watch option in Vue.js?

• To trigger a function whenever a reactive property changes

• To declaratively compute derived values

• To mutate the DOM

• To change another piece of state based on an async operation