在typescript中解决文字问题的正确方法是什么？

let firstName = "John";
let lastName = "Doe";
let fullName = firstName + " " + lastName; // 使用加号进行拼接
console.log(fullName); // 输出: John Doe

let firstName = "John";
let lastName = "Doe";
let fullName = `${firstName} ${lastName}`; // 使用模板字符串
console.log(fullName); // 输出: John Doe

let sentence = "The quick brown fox jumps over the lazy dog";
let words = sentence.split(" "); // 使用空格作为分隔符
console.log(words); // 输出: ["The", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"]

let sentence = "The quick brown fox jumps over the lazy dog";
let newSentence = sentence.replace("fox", "cat"); // 替换字符串中的"fox"为"cat"
console.log(newSentence); // 输出: The quick brown cat jumps over the lazy dog

function greet(name: string, age: number): string {
    return `Hello, my name is ${name} and I am ${age} years old.`;
}
console.log(greet("Alice", 30)); // 输出: Hello, my name is Alice and I am 30 years old.

let sentence = "";
let words = sentence ? sentence.split(" ") : []; // 如果sentence为空，则返回空数组
console.log(words); // 输出: []