如何只删除一次数组元素以使用 for 循环添加新元素

Question

What I am trying to do is:

1. set an array value (list) to another array (options).
2. If the user's input (searchVal) matches with a list value it will delete options, push this match, and then will keep pushing the next matches without deleting options again.

So according to the code below, if searchVal was "whatever" , options should return: ["whatever", "whatevEver1"] but, instead, it returns: ["whatever", "WhatEver1", "whatttever", "whatever", "whatevEver1"]

Relevant code:

var list = ["whatever", "WhatEver1", "whatttever"];
var clear = 0;
var options = [];
    
    
for (var i=0 ; i < list.length ; i++)
{
    options.push([list[i]]);
}
    
var searchVal = window.prompt(" ");
     
for (var i=0 ; i < list.length ; i++)
{
    if (list[i].toLowerCase().includes(searchVal.toLowerCase())) {
        if (clear == 0) {
            options.length = 0; 
        }
        options.push([list[i]]);
    }
    clear++;
}

return options;

Answer 1

Js arrays are pass-by-reference. In order to make independent copy of array you need to use:

let options = JSON.parse(JSON.stringify(list));

I didnt try to implement this to your problem cause im too lazy but i think it might work.