# 章序号/节序号/节/笔记序号
codecademy,scope
# 概念阐释
# 举例子
# 类比、比较与对比
# 问题
https://www.codecademy.com/projects/practice/training-days
As a seasoned athlete, one of your favorite activities is running marathons. You use a service called Training Days that sends you a message for the event you signed up for and the days you have left to train.
Since you also code, Training Days has asked you to help them solve a problem: **The program currently uses the wrong scope for its variables.** They know this can be troublesome as their service evolves. In this project you will make Training Days more maintainable and less error-prone by fixing variable scopes.
第一组把数据设置好，第二组就不用重新写了。*目前的结果还有点问题？*
# 问题答案
```js
// The scope of `random` is too loose
// const random = Math.floor(Math.random() * 3);
const getRandEvent = () => {
const random = Math.floor(Math.random() * 3);
if (random === 0) {
return 'Marathon';
} else if (random === 1) {
return 'Triathlon';
} else if (random === 2) {
return 'Pentathlon';
}
};
// The scope of `days` is too tight
const getTrainingDays = event => {
let days;
if (event === 'Marathon') {
days = 50;
} else if (event === 'Triathlon') {
days = 100;
} else if (event === 'Pentathlon') {
days = 200;
}
return days;
};
// The scope of `name` is too tight
const name = 'Nala';
const logEvent = (name,events) => {
// const name = 'Nala';
console.log(`${name}'s event is: ${event}`);
};
const logTime = (name,days) => {
// const name = 'Nala';
console.log(`${name}'s time to train is: ${days} days`);
};
const event = getRandEvent();
const days = getTrainingDays(event);
// Define a `name` variable. Use it as an argument after updating logEvent and logTime
logEvent(event,name);
logTime(days,name);
/*第二组竞争者*/
const event2 = getRandEvent();
const days2 = getTrainingDays(event2);
const name2='Warren';
logEvent(name2,event2);
logTime(name2,days2);
```
# 备注（经验集/错误集）
## 经验集
## 错误集
## 参考资料