使用Java脚本在数组中重复值的函数

Question

I need to create a function that inputs a new value into an empty array, and then the value stays in the array, even if the value changes. Let me explain with an example and I have so far:

var arr = [];
arr.unshift("f");
if (arr.length > 6) {
   arr.pop();
}
console.log(arr);

arr.unshift("e");
if (arr.length > 6) {
  arr.pop();
}
console.log(arr);

arr.unshift("d");
if (arr.length > 6) {
  arr.pop();
}
console.log(arr);

arr.unshift("c");
if (arr.length > 6) {
  arr.pop();
}
console.log(arr);

arr.unshift("b");
if (arr.length > 6) {
  arr.pop();
}
console.log(arr);

arr.unshift("a");
if (arr.length > 6) {
  arr.pop();
}
console.log(arr);
arr.unshift("z");
if (arr.length > 6) {
  arr.pop();
}
console.log(arr);

Here in the empty array a new value gets inputted in first position and stays in the array arr. This is what I get in the console:

(6) ["f"]    
(6) ["e", "f"]    
(6) ["d", "e", "f"]    
(6) ["c", "d", "e", "f"]    
(6) ["b", "c", "d", "e", "f"]    
(6) ["a", "b", "c", "d", "e", "f"]    
(6) ["z", "a", "b", "c", "d", "e"]

which is exactly what I want to achieve. Instead of these values I need a var that will get updated regularly.

var newValue = value_to_be_updated;

function myFunction(newValue) {
    var arr = [];
    arr.unshift(newValue);
    return arr
}

if (arr.length > 6) {
    arr.pop();
}

My goal is to reduce the above code and make it a function, but couldn't find anything helpful. Also is there any way the value inputted stays in the array, even if removed from the var?

Any help will be hugely appreciated!!!!!

Thanks in advance

Answer 1

You should be getting the new value dynamically using for example a prompt, if you are expecting the value of arr to remain the same after changing the source code that would not work. Still has @gurvinder372 said your function should look something like this

var arr = [];
function myFunction(newValue) {
  arr.unshift(newValue);
  if (arr.length > 6) {
    arr.pop();
  }
  return arr
}

then to use it you can do something like this

for (var i = 0; i<8; i++){
   var value = prompt('enter char');
   myFunction(value);
}