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do {
    // 1. Call the method
    let images = try await fetchImages()
    // 2. Fetch images method returns
    
    // 3. Call the resize method
    let resizedImages = try await resizeImages(images)
    // 4. Resize method returns
    
    print("Fetched \(images.count) images.")

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// 1. Call the method
fetchImages { result in
    // 3. The asynchronous method returns
    switch result {
    case .success(let images):
        print("Fetched \(images.count) images.")
        
        // 4. Call the resize method
        resizeImages(images) { result in
            // 6. Resize method returns

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class DatabaseManager {
    static let databaseObj = DatabaseManager()
    
    private init() {
    }
    
    func checkDatabaseAccess(user: String) {
        if user == ("Sung-Jie") {
            print("Access Granted!")
        } else {

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   ┌───────────────────────────┐
┌─>│           timers          │
│  └─────────────┬─────────────┘
│  ┌─────────────┴─────────────┐
│  │     pending callbacks     │
│  └─────────────┬─────────────┘
│  ┌─────────────┴─────────────┐
│  │       idle, prepare       │
│  └─────────────┬─────────────┘      ┌───────────────┐
│  ┌─────────────┴─────────────┐      │   incoming:   │

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const firstFunction = () => {
  console.log("Hello from the first function");
};

const secondFunction = () => {
  setTimeout(() => {
    console.log("Hello from the second function");
  }, 1000);
};

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const firstFunction = () => {
  console.log("Hello from the first function");
};

const secondFunction = () => {
  console.log("Hello from the second function");
};

firstFunction();
secondFunction();

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// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html

exports[`toUpperCase 1`] = `"FOOBAR"`;

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export const toUpperCase = (str: string) => str.toUpperCase();

if (import.meta.vitest) {
  const { it, expect } = import.meta.vitest;
  it("toUpperCase", () => {
    const result = toUpperCase("foobar");
    expect(result).toMatchSnapshot();
  });
}

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.
└── vitest-demo/
    └── coverage/
        └── index.ts.html

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import { defineConfig } from "vitest/config";

export default defineConfig({
  test: {
    includeSource: ["src/**/*.{js,ts}"],
    coverage: {
      reporter: ["text", "html"],
    },
  },
});