The methods that do not mutate the original array but always return a new array are known as non-mutation methods.

Following is a list of the non-mutation methods:

• filter() method
• concat() method
• slice() method

Let’s take an example to understand it better. We have a todo list replacing the old array with a new one based on the status filter.

Example:

1. vmvm.todos = vm.todos.filter(function (todo) {  
2.   return todo.status.match(/Completed/)  
3. })  

This approach would not re-render the entire list due to Vue.js implementation.