将数组元素与要放置在末尾的指定元素联接

input = ["Hi", "Bye", "Hello", "Jose", "Juan", null, "How", "", "Disco"];
console.log(input.filter(s => s && s != 'Bye').join("@") + '@Bye');

const input = ["Hi", "Bye", "Hello", "Jose", "Juan", null, "How", "", "Disco"];

let length = 0;

const result = input
  .filter((s) => {
    if (s === "Bye") ++length;
    return s && s !== "Bye";
  })
  .concat(Array.from({ length }, () => "Bye"))
  .join("@");

console.log(result);

const input = ['Hi', 'Bye', 'Hello', 'Jose', 'Juan', null, 'How', '', 'Disco'];

const output = input
  .filter(Boolean)
  .sort((a, b) => (a === 'Bye') - (b === 'Bye'))
  .join('@');

console.log(output);