Simple, shallow checked, remove item from array

removeItem.ts

export function removeItem<T>(array: Array<T>) {
  let cache = array
  let count = array.length

  let checkArrayContains = (() => Object.is(cache[0], cache[count - 1]))()
  let findCurrentIndex = (key: any) => cache.findIndex((item: any) => item === key)

  let immutableSlice = (start: number) => [...cache.slice(0, start), ...cache.slice(start + 1)]

  if (!Array.isArray(cache)) throw new Error('type error! [array] expected!')
  if (count === 0) throw new Error('provided array must contain at least one element')

  if (checkArrayContains) {
    throw new Error('provided array contains the same elements or contains less than two elements')
  }

  return (key: any) => {
    let current = findCurrentIndex(key)
    let result = immutableSlice(current)

    cache = result

    return cache
  }
}

const array = [1, 'ipsum', 3, 0x00f5f5, Symbol]
const remove = removeItem(array)

console.log(remove(Symbol))