--- id: 5688e62ea601b2482ff8422b title: 資料查找 challengeType: 1 videoUrl: 'https://scrimba.com/c/cDqW2Cg' forumTopicId: 18259 dashedName: profile-lookup --- # --description-- 我們有一個對象數組,裏面存儲着通訊錄。 `lookUpProfile` 函數已經寫好了參數,需要 `name` 和屬性 (`prop`) 參數。 函數將會檢查通訊錄中是否存在一個 `firstName` 與傳入的 `name` 相同的聯繫人。 如果存在,那麼還需要檢查對應的聯繫人中是否存在 `prop` 屬性。 如果它們都存在,函數返回 prop 屬性對應的值。 如果 `name` 不對應於任何聯繫人,然後返回字符串 `No such contact`。 如果 `prop` 屬性在匹配 `name` 的聯繫人裏不存在,返回 `No such property`。 # --hints-- `lookUpProfile("Kristian", "lastName")` 應該返回字符串 `Vos` ```js assert(lookUpProfile('Kristian', 'lastName') === 'Vos'); ``` `lookUpProfile("Sherlock", "likes")` 應該返回 `["Intriguing Cases", "Violin"]` ```js assert.deepEqual(lookUpProfile('Sherlock', 'likes'), [ 'Intriguing Cases', 'Violin' ]); ``` `lookUpProfile("Harry", "likes")` 應該返回一個數組 ```js assert(typeof lookUpProfile('Harry', 'likes') === 'object'); ``` `lookUpProfile("Bob", "number")` 應該返回字符串 `No such contact` ```js assert(lookUpProfile('Bob', 'number') === 'No such contact'); ``` `lookUpProfile("Bob", "potato")` 應該返回字符串 `No such contact` ```js assert(lookUpProfile('Bob', 'potato') === 'No such contact'); ``` `lookUpProfile("Akira", "address")` 應該返回字符串 `No such property` ```js assert(lookUpProfile('Akira', 'address') === 'No such property'); ``` # --seed-- ## --seed-contents-- ```js // Setup const contacts = [ { firstName: "Akira", lastName: "Laine", number: "0543236543", likes: ["Pizza", "Coding", "Brownie Points"], }, { firstName: "Harry", lastName: "Potter", number: "0994372684", likes: ["Hogwarts", "Magic", "Hagrid"], }, { firstName: "Sherlock", lastName: "Holmes", number: "0487345643", likes: ["Intriguing Cases", "Violin"], }, { firstName: "Kristian", lastName: "Vos", number: "unknown", likes: ["JavaScript", "Gaming", "Foxes"], }, ]; function lookUpProfile(name, prop) { // Only change code below this line // Only change code above this line } lookUpProfile("Akira", "likes"); ``` # --solutions-- ```js const contacts = [ { firstName: "Akira", lastName: "Laine", number: "0543236543", likes: ["Pizza", "Coding", "Brownie Points"], }, { firstName: "Harry", lastName: "Potter", number: "0994372684", likes: ["Hogwarts", "Magic", "Hagrid"], }, { firstName: "Sherlock", lastName: "Holmes", number: "0487345643", likes: ["Intriguing Cases", "Violin"], }, { firstName: "Kristian", lastName: "Vos", number: "unknown", likes: ["JavaScript", "Gaming", "Foxes"], }, ]; function lookUpProfile(name, prop) { for (let i in contacts) { if (contacts[i].firstName === name) { return contacts[i][prop] || "No such property"; } } return "No such contact"; } ```