JSbasic/test2.js at main · ZhenLiChen/JSbasic · GitHub

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// //part 1
// const userName = "Chenzhenli";//String
// const age = 23;//number
// const isStudent = true; //布尔
// console.log(typeof(age));
// console.log(typeof(userName));
// console.log(typeof(isStudent));

// let a = 123
// let b = "hello"
// let c = true
// let d
// let e = null
// console.log(typeof(a));
// console.log(typeof(b));
// console.log(typeof(c));
// console.log(typeof(d));
// console.log(typeof(e));

// //Part 2
// // 15
// //105
// //5

// const score = 56;

// if (score >= 90) {
//  console.log("good");
// } else if (score >= 60 && score < 90){
//  console.log("pass");
// } else {
//    console.log("fail");
// }

// score >= 90? console.log("good"):(score >= 60?console.log("pass"):console.log("fail"))

// //Part3

// // const add = (a,b) => a + b;
// // console.log(add(7,8));

// const add = function (a,b){
//     return a + b
// }
// console.log(add(7,8));

// const isAdult = age => {
//     if (age >= 18){
//         return true;
//     }else {
//         return false;
//     }
// }

// console.log(isAdult(20));

// const getPrice = item => {
//     if (item === "Member"){
//         return 80;
//     } else{
//         return 100;
//     }
// }
// console.log(getPrice("Member"));

// //P4
// const fruits = ["banana", "lemon", "apple"];
// console.log(fruits[0]);
// console.log(fruits[fruits.length - 1]);

// fruits.push("durain");
// console.log(fruits)
// fruits.pop();
// console.log(fruits)
// console.log(fruits.length);

// //P5
// const person = {
//     name: "chenzhenli",
//     age: 23,
//     gender: "female"
// }
// console.log(person.name);
// person.age = 21;
// console.log(person);
// person.hobby = "reading";
// console.log(person);

// const introduce = item => `I'm ${item.name},kotoshi ${item.age} sai desu`;
// console.log(introduce(person));

// //P6
// let users = [
//   { name: "Tom", age: 17 },
//   { name: "Jerry", age: 20 },
//   { name: "Lucy", age: 16 }
// ]

// users.forEach(item => console.log(item));
// const finalResult = users
//     .filter(item => item.age >=18)
//     .map(item => item.name)//使用map一般表示我需要返回一个array，如果只是打印就不需要

// console.log(finalResult);


//ex1
//2010；10；true；false

//ex2
let hero = {
    name: "Chen",
    level: 10,
    equipment: ["木剑", "布衣"],
    stats: {
        hp: 100,
        mp: 50
    }
};
hero.equipment.push("铁盾");
console.log(hero);
const levelUp = target => {
    target.level += 1;
    target.stats.hp += 20;
};
levelUp(hero);
console.log(hero);

console.log(hero.equipment[2]);

//第三题
let orders = [
    { id: 1, dish: "牛肉面", price: 25, status: "completed" },
    { id: 2, dish: "小笼包", price: 15, status: "pending" },
    { id: 3, dish: "大盘鸡", price: 80, status: "completed" },
    { id: 4, dish: "奶茶", price: 18, status: "completed" }
];
const finalPrice = orders
    .filter(item => item.status === "completed")
    .reduce((acc,cur) => acc + cur.price , 0)

console.log(finalPrice);