Array.prototype.slice()

const animals = ["ant", "bison", "camel", "duck", "elephant"];

console.log(animals.slice(2));
// Expected output: Array ["camel", "duck", "elephant"]

console.log(animals.slice(2, 4));
// Expected output: Array ["camel", "duck"]

console.log(animals.slice(1, 5));
// Expected output: Array ["bison", "camel", "duck", "elephant"]

console.log(animals.slice(-2));
// Expected output: Array ["duck", "elephant"]

console.log(animals.slice(2, -1));
// Expected output: Array ["camel", "duck"]

console.log(animals.slice());
// Expected output: Array ["ant", "bison", "camel", "duck", "elephant"]

slice()
slice(start)
slice(start, end)

const fruits = ["Banana", "Orange", "Lemon", "Apple", "Mango"];
const citrus = fruits.slice(1, 3);

// fruits 包含 ['Banana', 'Orange', 'Lemon', 'Apple', 'Mango']
// citrus 包含 ['Orange','Lemon']

// 使用 slice 方法从 myCar 创建一个 newCar。
const myHonda = {
  color: "red",
  wheels: 4,
  engine: { cylinders: 4, size: 2.2 },
};
const myCar = [myHonda, 2, "cherry condition", "purchased 1997"];
const newCar = myCar.slice(0, 2);

console.log("myCar =", myCar);
console.log("newCar =", newCar);
console.log("myCar[0].color =", myCar[0].color);
console.log("newCar[0].color =", newCar[0].color);

// 改变 myHonda 对象的 color。
myHonda.color = "purple";
console.log("The new color of my Honda is", myHonda.color);

console.log("myCar[0].color =", myCar[0].color);
console.log("newCar[0].color =", newCar[0].color);

myCar = [
  { color: 'red', wheels: 4, engine: { cylinders: 4, size: 2.2 } },
  2,
  'cherry condition',
  'purchased 1997'
]
newCar = [ { color: 'red', wheels: 4, engine: { cylinders: 4, size: 2.2 } }, 2 ]
myCar[0].color = red
newCar[0].color = red
The new color of my Honda is purple
myCar[0].color = purple
newCar[0].color = purple

const arrayLike = {
  length: 3,
  0: 2,
  1: 3,
  2: 4,
};
console.log(Array.prototype.slice.call(arrayLike, 1, 3));
// [ 3, 4 ]

// 调用 slice() 方法时，会将 this 对象作为第一个参数传入
const slice = Function.prototype.call.bind(Array.prototype.slice);

function list() {
  return slice(arguments);
}

const list1 = list(1, 2, 3); // [1, 2, 3]

console.log([1, 2, , 4, 5].slice(1, 4)); // [2, empty, 4]