Interpretation of js array insertion and deletion processing methods (with code)

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function insertArray(arr, val, compare, maxLen) {  //返回位置
  const index = arr.findIndex(compare)  if (index === 0) {    return
  }  if (index > 0) {      //删除一个
    arr.splice(index, 1)
  }  //再插入（unshift() 方法可向数组的开头添加一个或更多元素，并返回新的长度）  arr.unshift(val)  if (maxLen && arr.length > maxLen) {      //pop() 方法用于删除并返回数组的最后一个元素。    arr.pop()
  }
}

Delete

function deleteFromArray(arr, compare) {
  const index = arr.findIndex(compare)  if (index > -1) {
    arr.splice(index, 1)
  }
}

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