首頁猿問在 JS 中使用值嵌套 Reduce

在 JS 中使用值嵌套 Reduce

JavaScript

回首憶惘然 2023-10-20 15:12:13

早上好，在array.map之后，我有一個包含相同分配和一些嵌套評級的數組：const assignments = [ { name: "assignmentOne", difficultyRating: 1, funRating: 2 }, { name: "assignmentOne", difficultyRating: 3, funRating: 4 }, { name: "assignmentOne", difficultyRating: 5, funRating: 1 }]現在我想獲得總難度/樂趣評級，它看起來像以下之一：//Both the difficulty and fun rating in the same recordconst assignmentsTotal = [ { name: "assignmentOne", totalDifficultyRating: 9, totalFunRating: 7 }]//Difficulty and fun rating as separate recordsconst assignmentsDifficultyTotal = [ { name: "assignmentOne", totalDifficultyRating: 9 }]const assignmentsFunTotal = [ { name: "assignmentOne", totalFunRating: 7 }]我非常有信心做到這一點的最佳方法是使用reduce方法。經過一番挖掘后，唯一接近我想要實現的目標的是下面的文章，但我無法讓它正常工作。有沒有一種好的方法可以從上面的起點做到這一點，或者使用array.map創建單獨的數組并在使用reduce方法之后會更好嗎？

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2 回答

catspeake

TA貢獻1111條經驗獲得超0個贊

如果您正在數組中尋找相同的“名稱”對象，下面應該可以：

const reducer = assignments.reduce((total, current) => {
    return { name: current.name, difficultyRating : total.difficultyRating + current.difficultyRating, funRating : total.funRating + current.funRating } });

如果你想按名稱對對象進行分組，請查看 lodash groupby 函數。一般來說，lodash 在所有數組/對象功能中都非常方便。

反對回復 2023-10-20

鴻蒙傳說

TA貢獻1865條經驗獲得超7個贊

const assignments = [{

difficultyRating: 1,

funRating: 2

{

difficultyRating: 3,

funRating: 4

{

difficultyRating: 5,

funRating: 1

{

difficultyRating: 5,

funRating: 3

{

difficultyRating: 5,

funRating: 1

}

];

// if you want the totals as an array:

const assignmentsTotalArray = assignments.reduce((totalArr, item) => {

// check whether the assignment is already in the array

const assignmentIndex = totalArr.findIndex(elem => elem.name === item.name);

// if the assignment is not in the array, add it and initialize the totals

// otherwise update the totals

if (assignmentIndex === -1) {

totalArr.push({

totalDifficultyRating: item.difficultyRating,

totalFunRating: item.funRating

});

} else {

totalArr[assignmentIndex].totalDifficultyRating += item.difficultyRating;

totalArr[assignmentIndex].totalFunRating += item.funRating;

}

return totalArr;

}, []);

console.log('### assignmentsTotalArray:');

console.log(assignmentsTotalArray);

// if you want the totals as an object:

const assignmentsTotalObject = assignments.reduce((totalObj, item) => {

// if the output object already contains the assignment, sum the ratings

// otherwise create a new key for the assignment and initialize the ratings

if (totalObj[item.name]) {

totalObj[item.name].totalDifficultyRating += item.difficultyRating;

totalObj[item.name].totalFunRating += item.funRating;

} else {

totalObj[item.name] = {

totalDifficultyRating: item.difficultyRating,

totalFunRating: item.funRating

};

}

return totalObj;

}, {});

console.log('### assignmentsTotalObject:')

console.log(assignmentsTotalObject);

反對回復 2023-10-20

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在 JS 中使用值嵌套 Reduce

在 JS 中使用值嵌套 Reduce

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