从中删除元素

Question

我试图在不使用任何递归方法的情况下从数组中删除第一个元素。我的代码有什么问题？

Answer 1

为了从数组中删除元素，您通常使用 array.splice(startingPosition, howMuchElementsYou'dLikeToRemove)，您不能 decrement 数组并从中删除元素，就像您在 post 中所做的那样.

我不确定我是否正确理解了你的问题，但是，这样的事情可能会对你有所帮助：

let arr=[4,2];
function rem(arr){
// If the arr length is higher than 2 (which means 3+), delete the first element leaving
// only two elements in the array.
 if(arr.length > 2) {
   // Remove - splice - the FIRST element in the array. (0 - means first element, 1 - is
   // how much elements from that position you'd like to remove from the array).
   arr.splice(0, 1)
 } else {
   // Call the function
   rem(arr);
 }
}
// Call the function
rem(arr);"

如果这与您的问题无关，请更好地编辑您的问题，以便我们了解您的确切需求。希望这有帮助，干杯。

Answer 2

arr=[1,2,3,4];
function rem(arr){
let res=[];
if(!this.index)  // optional if index is maintaining in outside
    this.index = 0; // optional, this would get created as a global variable & make sure that you haven't use this variable in somewhere else.
if(arr.length>1){
    if (this.index<arr.length-1){
        arr[this.index]=arr[this.index+1];
        this.index++;
        return rem(arr);
    }
    else{
        this.index = undefined; // optional, make it to initial state
        arr.length--;
        return arr;
    }
 }
 this.index = undefined; // optional, make it to initial state
 return res;
 }

从中删除元素

Remove element from

javascript

arrays

shift