Q21. Why should not use if and for directives together on the same element?
It is recommended not to use v-if on the same element as v-for. Because v-if directive has a higher priority than v-for. There are two cases where developers try to use t...
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Q22. Why do you need to use key attribute on for directive?
In order to track each node's identity, and thus reuse and reorder existing elements, you need to provide a unique `key` attribute for each item with in `v-for` iteration...
Q23. What are the array detection mutation methods?
As the name suggests, mutation methods modifies the original array. Below are the list of array mutation methods which trigger view updates. 1. push() 2. pop() 3. shift()...
Q24. What are the array detection non-mutation methods?
The methods which do not mutate the original array but always return a new array are called non-mutation methods. Below are the list of non-mutation methods, 1. filter() ...
Q25. What are the caveats of array changes detection?
Vue cannot detect changes for the array in the below two cases, 1. When you directly set an item with the index,For example, ```javascript vm.todos[indexOfTodo] = newTodo...
Q26. What are the caveats of object changes detection?
Vue cannot detect changes for the object in property addition or deletion. Lets take an example of user data changes, ```javascript var vm = new Vue({ data: { user: { nam...
Q27. How do you use v-for directive with a range?
You can also use integer type(say 'n') for `v-for` directive which repeats the element many times. ```javascript {{ n }} ``` It displays the number 1 to 20. ****
Q28. How do you use v-for directive on template?
Just similar to v-if directive on template, you can also use a `` tag with v-for directive to render a block of multiple elements. Let's take a todo example, ```javascrip...
Q29. How do you use event handlers?
You can use event handlers in vue similar to plain javascript. The method calls also support the special $event variable. ```javascript Submit methods: { show: function (...
Q30. What are the event modifiers provided by Vue?
Normally, javascript provides `event.preventDefault() or event.stopPropagation()` inside event handlers. You can use methods provided by vue, but these methods are meant ...