JavaScript에서 숫자나 문자 범위를 어떻게 만들 수 있나요?

[...Array(5).keys()]; // [0, 1, 2, 3, 4]

String.fromCharCode(...[...Array('D'.charCodeAt(0) - 'A'.charCodeAt(0) + 1).keys()].map(i => i + 'A'.charCodeAt(0))); // "ABCD"

for (const x of Array(5).keys()) {
  console.log(x, String.fromCharCode('A'.charCodeAt(0) + x));
} // 0,"A" 1,"B" 2,"C" 3,"D" 4,"E"

function range(size, startAt = 0) {
  return [...Array(size).keys()].map(i => i + startAt);
}

function characterRange(startChar, endChar) {
  return String.fromCharCode(...range(endChar.charCodeAt(0) -
            startChar.charCodeAt(0), startChar.charCodeAt(0)))
}

console.log(range(5)); // [0, 1, 2, 3, 4]
console.log(characterRange('A', 'C')); // "ABC"

_.range(10); // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
_.range(1, 11); // [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]