When working with non-mutating methods, you can replace the old array with the new one: example1. const arr css, js, ts console.log(arr. The splice () method is used to add or remove elements of an existing array and the return value will be the removed items from the array.

We first used the Array.indexOf method to get the index of the element. This method returns a new array after removing the items and mutates the original array. The index (first parameter) is required and the rest are optional. To do this we can find the index of the array we want to remove with indexOf, and remove that item with splice The splice() function changes the contents of. It takes three arguments index, number of items to delete, and an array of items to be appended.

filter(), concat() and slice(), which do not mutate the original array but always return a new array. We changed the position of the array element with value css from index 0 to index 2. The splice method is used to extract the range of elements from an array. In comparison, there are also non-mutating methods, e.g. Mutation methods, as the name suggests, mutate the original array they are called on. v-for also supports an optional second argument for the index of the current item. Inside v-for blocks we have full access to parent scope properties. The v-for directive requires a special syntax in the form of item in items, where items is the source data array and item is an alias for the array element being iterated on: We can use the v-for directive to render a list of items based on an array. The numeric array elements are displayed before and after. Learn how to render list with a free Vue School lesson Mapping an Array to Elements with v-for After that, the array splice method is used for removing the third element by zero-based index number.

Js splice index