首頁猿問遍歷對象數組并使用迭代值創建新對象

遍歷對象數組并使用迭代值創建新對象

JavaScript

30秒到達戰場 2023-01-06 15:45:20

第一次在這里發帖，希望得到一些幫助，我似乎無法弄清楚如何解決這個問題。它基本上是創建一個函數來接收返回新對象的對象數組。由于某種原因，推送不會通過并返回推送的錯誤屬性未定義。const organizeInstructors = function(instructors) { let output = {}; // so the obvious which is to create the object for (let i = 0; i < instructors.length; i++) { if (!output[instructors[course]]) { output[instructors[course]] = instructors[course]; } else { output[instructors[course]].push(instructors[name]); } } return output;};console.log(organizeInstructors([{ name: "Samuel", course: "iOS" }, { name: "Victoria", course: "Web" }, { name: "Karim", course: "Web" }, { name: "Donald", course: "Web" }]));預期產出{ iOS: ["Samuel"], Web: ["Victoria", "Karim", "Donald"]}感謝你們提供的任何建議或提示

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3 回答

蝴蝶不菲

TA貢獻1810條經驗獲得超4個贊

看起來您對遍歷數組與鍵入對象有點困惑。

let organizeInstructors = function(instructors) {

let output = {}; // so the obvious which is to create the object

for(let i = 0; i < instructors.length; i++) {

const instructor = instructors[i]

if(!output[instructor.course]) {

output[instructor.course] = []

}

output[instructor.course].push(instructor.name)

}

return output;

}

console.log(organizeInstructors([

{name: "Samuel", course: "iOS"},

{name: "Victoria", course: "Web"},

{name: "Karim", course: "Web"},

{name: "Donald", course: "Web"}

]))

添加 constinstructor也使其更易于閱讀

反對回復 2023-01-06

白衣非少年

TA貢獻1155條經驗獲得超0個贊

使用reduce

data = [ { name: "Samuel", course: "iOS" }, { name: "Victoria", course: "Web" }, { name: "Karim", course: "Web" }, { name: "Donald", course: "Web" }, ];

getObj = (data) =>

data.reduce(

(r, c) => (

!r[c.course] // checks if accumulator doesn't have c.course as key

? ((r[c.course] = []), r[c.course].push(c.name)) // then make an array that corresponds the key then push c.name

: r[c.course].push(c.name), // else push c.name to the corresponding array

{}

);

console.log(getObj(data));

反對回復 2023-01-06

慕標琳琳

TA貢獻1830條經驗獲得超9個贊

這使用Array.prototype.reduce方法。

請注意，這不會檢查該值是否已存在于課程數組中，只會盲目添加。這可能意味著您在同一課程中獲得多個同名實例。

const organizeInstructors = function(instructors) {

return instructors.reduce((cumulative, current) => {

// if we don't have a course in cumulative object, add it.

if (!cumulative[current.course]) cumulative[current.course] = [];

// add in the current name.

cumulative[current.course].push(current.name);

// return the cumulative object for the next iteration.

return cumulative;

}, {});

}

console.log(organizeInstructors([{

course: "iOS"

{

course: "Web"

{

course: "Web"

{

course: "Web"

}

]));

反對回復 2023-01-06

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