为了更好的可读性，是否有可能重构和完全避免许多(如果是else )语句
为了更好的可读性，是否有可能重构和完全避免许多(如果是else )语句
提问于 2016-11-30 20:30:03
为了更好的可读性，是否有可能重构和完全避免许多(如果是else )语句。例如：
function canIWatch(age) {
if (age < 6 && age > 0) return "You are not allowed to watch Deadpool after 6:00pm.";
else if (age >=6 && age < 17) return "You must be accompanied by a guardian who is 21 or older.";
else if (age >=17 && age < 25) return "You are allowed to watch Deadpool, right after you show some ID.";
else if (age >= 25 && age < 50 ) return "Yay! You can watch Deadpool with no strings attached!";
else if (age >= 50) return " You are too old to watch deadpool";
else return "Invalid age."
}我如何在没有这么多语句的情况下编写更简洁的代码？
回答 2
Stack Overflow用户
回答已采纳
发布于 2016-11-30 20:33:54
您可以更改检查，从最小值开始，跳过其他部分，因为您返回。
function canIWatch(age) {
if (age < 0) {
return "Invalid age."
}
if (age < 6) {
return "You are not allowed to watch Deadpool after 6:00pm.";
}
if (age < 17) {
return "You must be accompanied by a guardian who is 21 or older.";
}
if (age < 25) {
return "You are allowed to watch Deadpool, right after you show some ID.";
}
if (age < 50) {
return "Yay! You can watch Deadpool with no strings attached!";
}
return "You are too old to watch deadpool";
}
console.log(canIWatch(-1));
console.log(canIWatch(2));
console.log(canIWatch(8));
console.log(canIWatch(20));
console.log(canIWatch(28));
console.log(canIWatch(60));
另一种解决方案是为术语使用带有对象的数组。
function canIWatch(age) {
var terms = [
{ age: 0, text: "Invalid age." },
{ age: 6, text: "You are not allowed to watch Deadpool after 6:00pm." },
{ age: 17, text: "You must be accompanied by a guardian who is 21 or older." },
{ age: 25, text: "You are allowed to watch Deadpool, right after you show some ID." },
{ age: 50, text: "Yay! You can watch Deadpool with no strings attached!" },
{ age: Infinity, text: "You are too old to watch deadpool" },
],
text;
terms.every(function (a) {
text = a.text;
return a.age <= age;
});
return text;
}
console.log(canIWatch(-1));
console.log(canIWatch(2));
console.log(canIWatch(8));
console.log(canIWatch(20));
console.log(canIWatch(28));
console.log(canIWatch(60));
Stack Overflow用户
发布于 2016-11-30 20:35:35
如果你使用的是返回，那么你至少应该避免使用其他的，但是如果只使用
function canIWatch(age) {
if (age < 6 && age > 0) return "You are not allowed to watch Deadpool after 6:00pm.";
if (age >=6 && age < 17) return "You must be accompanied by a guardian who is 21 or older.";
if (age >=17 && age < 25) return "You are allowed to watch Deadpool, right after you show some ID.";
if (age >= 25 && age < 50 ) return "Yay! You can watch Deadpool with no strings attached!";
if (age >= 50) return " You are too old to watch deadpool";
return "Invalid age."
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/40897593
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