设置匿名函数TypeScript的类型

const myFunction: () => void = function() {
  // 函数体
};

const sum: (a: number, b: number) => number = function(a, b) {
  return a + b;
};

function execute(callback: () => void) {
  // 执行一些操作
  callback();
}

execute(function() {
  console.log('回调函数被执行了');
});

const numbers: number[] = [1, 2, 3, 4, 5];

const squaredNumbers: number[] = numbers.map(function(number) {
  return number * number;
});

const myObject = {
  sayHello: function() {
    console.log('Hello!');
  }
};

myObject.sayHello();