Convert list to array in JavaScript

x = array_to_list([10, 20]);
console.log(JSON.stringify(x));

function list_to_array(list) {
  arr = [];
  for (const property in list) {
    if (property == "value") {
      arr.push(property);
    } else if (property == "rest") {
      for (const property in rest) {
        arr.push(property);
      }
    }
  }
}
console.log(JSON.stringify(list_to_array(x)));

but I get the error Uncaught ReferenceError ReferenceError: rest is not defined how can I iterate in the rest object ? or how would you do this function

this functions transform a list to an array