How do I update a variable inputted to a function?

I am trying to make a function in my js file that will remove an item from an array and then save the new array to the variable. But here’s the thing: I don’t want it to only save ONE variable, I want it to save any array variable that I input. What I mean is something like this:

const list = [1,2,3];

function removeItem(array,index)
{
    let newArray = [];
    for(var i = 0 ; i < array.length ; i++)
    {
        if(i != index)
        {
            newArray.push(array[i]);
        }
    }
    array = newArray; // where it saves the variable
}

removeItem(list,0);

Answer

You can create a prototype function, see this

Array.prototype.removeItem = function(what) {
    if (this.indexOf(what) >= 0) this.splice(this.indexOf(what), 1);
}
var foo = [1, 2, 3];
foo.removeItem(2);
console.log(foo);