An array containing the elements that were removed.
const array = [1, 2]
const replaceWith = [3, 4]
const removed = replaceArray(array, replaceWith)
console.log(array, removed) // [3, 4] , [1, 2]
// replaceWith is not mutated
console.log(replaceWith) // [3, 4]
The replaceWith array can be a different size from the target array.
// replaceWith is smaller than target
const array = [1, 2]
const removed = replaceArray(array, [3])
console.log(array, removed) // [3] , [1, 2]
// replaceWith is larger than target
const array = [1]
const removed = replaceArray(array, [2, 3])
console.log(array, removed) // [2, 3] , [1]
Removes all elements from the target array and inserts new elements in their place. The target array will be mutated in-place.