Identifying an array using a string JavaScript-CodePudding

I am having difficulties with returning a pre-declared array from user feedback. This is an exercise meant to help me understand how to take user input using a drop-down in HTML and return a value based on a script.

What I want the second part of the script to do is return the array whose name is the string selected by the user.

/* This part works in returning the array I need, but it requires that they are placed 
inside an object and returning them based on the key,
which I would want to avoid. */

const obj = { att: [1, 1, 1, 1], btt: [2, 2, 2, 2], ctt: [3, 3, 3, 3], dtt: [4, 4, 4, 4] };
function getOption() {
  let choice = document.getElementById("mySelect").value;
  function pick(name) {
    return obj[String(name)];
  }
  document.getElementById("demo").innerHTML = pick(choice);
// Drop-down choice "att", output "[1,1,1,1]".
}

/* Here, although the arrays are named One and Two and I return a string that is either
"One" or "Two", JS doesn't seem to notice that those are array names
and returns the string themselves. */

const One = ['a','a'];
const Two = ['b','b'];
function getSecondOption() {
  let choice = document.getElementById("mySelectZwei").value;
  function pick(name) {
    return String(name);
  }
  document.getElementById("demoZwei").innerHTML = pick(choice);
// Drop-down choice "One", output "One".
}

I have tried not using String() in the second part but it did not change anything. Array.isArray() doesn't seem to work, either, so it's clear that the editor doesn't see a connection between the array names and the strings.

Would appreciate any feedback telling me what to look into or suggestions for solutions.

Thanks a lot!

CodePudding user response：

If I'm not mistaken you could use var instead of const this way variables would not be scoped and attached to the global object window and so be accessible using window[name].

try

var One = ['a','a'];
var Two = ['b','b'];
function getSecondOption() {
  let choice = document.getElementById("mySelectZwei").value;
  function pick(name) {
    return window[name];
  }
  document.getElementById("demoZwei").innerHTML = pick(choice);
}