spliceOne.js

// As of V8 6.6, depending on the size of the array, this is anywhere
// between 1.5-10x faster than the two-arg version of Array#splice()
export function spliceOne(list, index) {
  for (; index + 1 < list.length; index++) {
    list[index] = list[index + 1]
  }

  list.pop()
}