如何对 Angular 上的数组进行排序和映射 7

Question

我有这个数组：

myArray = {
[0]{priority: 1, percent: 90, correct: true}
[1]{priority: 1, percent: 20, correct: true}
[2]{priority: 2, percent: 50, correct: true}
[3]{priority: 2, percent: 50, correct: true}
[4]{priority: 3, percent: 70, correct: true}
[5]{priority: 3, percent: 50, correct: true}
}

如何按优先级添加百分比，然后将所有给我超过 100 的结果的值“正确”更改为“错误”？

例如：

优先级 1 有 2 个值：90 和 20 = 110
优先级 2 有 2 个值：50 和 50 = 100
优先级 3 有 2 个值：70 和 50 = 120
因此所有优先级为 1 的对象都应将值“correct”更改为“false”
所有优先级为 2 的对象都应将值“correct”更改为“correct”
所有优先级为 3 的对象都应将值“correcto”更改为“false”

Answer 1

提供快速解决方案，但也可能有很多更好的解决方案：

myArray = [
{priority: 1, percent: 90, correct: true},
{priority: 1, percent: 20, correct: true},
{priority: 2, percent: 50, correct: true},
{priority: 2, percent: 50, correct: true},
{priority: 3, percent: 70, correct: true},
{priority: 3, percent: 50, correct: true},
];

tempMap = new Map();

myArray.forEach( (item) => {
  if(tempMap.has(item.priority)) {
    tempMap.set(item.priority, tempMap.get(item.priority) + item.percent);
  }
  else {
    tempMap.set(item.priority, item.percent);
  }
});

myArray.forEach( (item) => {
  item.correct = tempMap.get(item.priority) > 100 ? false : true;
});

console.log(myArray);

Answer 2

     const myArray: { priority: number; percent: number; correct: boolean }[] = [
  { priority: 1, percent: 90, correct: true },
  { priority: 1, percent: 20, correct: true },
  { priority: 2, percent: 50, correct: true },
  { priority: 2, percent: 50, correct: true },
  { priority: 3, percent: 70, correct: true },
  { priority: 3, percent: 50, correct: true },
];
   




 const newArr = myArray
      .sort((a, b) => a.priority - b.priority)
      .map((val, i, myArray) => {
        const percentSum = myArray
          .filter((a) => a.priority == val.priority)
          .map((b) => b.percent)
          .reduce((a, b) => a + b, 0);
        const arrObj = {
          ...val,
          correct: percentSum > 100 ? false : true,
        };
        return arrObj;
      });

    console.log(newArr);

输出

[{
  correct: false,
  percent: 90,
  priority: 1
}, {
  correct: false,
  percent: 20,
  priority: 1
}, {
  correct: true,
  percent: 50,
  priority: 2
}, {
  correct: true,
  percent: 50,
  priority: 2
}, {
  correct: false,
  percent: 70,
  priority: 3
}, {
  correct: false,
  percent: 50,
  priority: 3
}]

如何对 Angular 上的数组进行排序和映射 7

How to Sort and Map an Array on Angular 7

typescript

angular

angular7