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* 任務：實作一個函式 `classifyAge`，根據年齡進行分類。
*
* 範例：
* classifyAge(10) 應該回傳 "Child"
* classifyAge(15) 應該回傳 "Teenager"
* classifyAge(30) 應該回傳 "Adult"
* classifyAge(70) 應該回傳 "Senior"
*
* @param age - 一個需要被分類的年齡
* @returns - 回傳年齡的分類結果
*/
const ageClassification = {
Child: 10,
Teenager: 15,
Adult: 30,
Senior: 70
}
export function classifyAge(age: number): string {
// 請在此處寫下你的程式碼
// #NOTES: 因為 'string' 類型的運算式無法用於索引類型
// TypeScript 預設不允許使用 string 類型的變數來索引物件，除非該物件明確地定義了 string 索引簽章
let previousClassification = null;
for (let classification in ageClassification) {
if (age <= ageClassification[classification as keyof typeof ageClassification]) {
return classification;
}
previousClassification = classification;
}
return previousClassification ?? '';
}
classifyAge(10);
classifyAge(15);
// for (const key in ageClassification) {
// if (age < ageClassification[key as keyof typeof ageClassification]) {
// console.log(key);
// return key;
// }
// } |