The Ractive equivalent to
Array.splice that can add new elements to the array while removing existing elements.
ractive.splice( keypath, index, removeCount, add... )
Promise(see Promises) that will resolve with the removed elements after the update is complete.
The keypath of the array to change, e.g.
The index at which to start the operation.
The number of elements to remove starting with the element at
index. This may be 0 if you don't want to remove any elements.
Any elements to insert into the array starting at
index. There can be 0 or more elements passed to add to the array.
If the given keypath does not exist (is
undefined), an empty array will be supplied instead. Otherwise, if the given keypath does not resolve to an array, an error will be thrown.