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What are the caveats of array changes detection?

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Vue cannot detect changes for the array in the below two cases,

  1. When you directly set an item with the index,For example,
    vm.todos[indexOfTodo] = newTodo
  2. When you modify the length of the array, For example,
vm.todos.length = todosLength

You can overcome both the caveats using set and splice methods, Let's see the solutions with an examples,

First use case solution

// Vue.set
Vue.set(vm.todos, indexOfTodo, newTodoValue)
(or)
// Array.prototype.splice
vm.todos.splice(indexOfTodo, 1, newTodoValue)

Second use case solution

vm.todos.splice(todosLength)
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