Question

我有一个对象数组，其中一些属性作为字符串值，有人可以帮我从中获取数字。这是数组的样子。

  scores = [
               {
                  maxScore:"100"
                  obtainedScore:"79"
                  passed:"pass"
                  subject:"Maths"
               },
               {
                  maxScore:"100"
                  obtainedScore:"73"
                  passed:"pass"
                  subject:"Science"
               },
               {
                  maxScore:"100"
                  obtainedScore:"82"
                  passed:"pass"
                  subject:"English"
               }
           ]

我希望获得的分数和 maxScore 应从这些对象中取出并将它们放在两个不同的数组中

我试过这个

for (var  i =0 ; i < score.length; i++)
{ 
   var marks[i] = parseInt(score[i].obtainedScore) ;
}

我找到了NaN。

Answer 1

基于您的尝试的正确回答：

＆＃13;

    var scores = [{
      maxScore: "100",
      obtainedScore: "79",
      passed: "pass",
      subject: "Maths"
    }, {
      maxScore: "100",
      obtainedScore: "73",
      passed: "pass",
      subject: "Science"
    }, {
      maxScore: "100",
      obtainedScore: "82",
      passed: "pass",
      subject: "English"
    }]
    var marks = [];
    for (var i = 0; i < scores.length; i++) {
      marks[i] = parseInt(scores[i].obtainedScore, 10);
    }
    console.log(marks)

＆＃13;

MY SOLN （在您尝试编辑之前）

＆＃13;

var scores = [{
      maxScore: "100",
      obtainedScore: "79",
      passed: "pass",
      subject: "Maths"
    }, {
      maxScore: "100",
      obtainedScore: "73",
      passed: "pass",
      subject: "Science"
    }, {
      maxScore: "100",
      obtainedScore: "82",
      passed: "pass",
      subject: "English"
    }]

    function decoupler(arr, prop) {
      return arr.map(function(item, index) {
        return parseInt(item[prop], 10);
      });
    }
    var arr1 = decoupler(scores, "maxScore");
    var arr2 = decoupler(scores, "obtainedScore");

    console.log(arr1);
    console.log(arr2);

＆＃13;

修改：根据comment by jfriend00为parseInt()添加了基数参数。

Answer 2

我不是100％确定你想要输出的是什么，但是：

我希望获得的分数和maxScore应该从这些中取出对象并将它们放在两个不同的数组中

var arrScore = [],
        arrMax = [];

    scores.forEach(i => {
        arrScore.push(!isNaN(parseInt(i.obtainedScore)) ? parseInt(i.obtainedScore) : 0);
        arrMax.push(!isNaN(parseInt(i.maxScore)) ? parseInt(i.maxScore) : 0);
    });

基本上，这会创建两个数组arrScore，其中包含每个单独的分数值，arrMax包含最大分数数组。

使用forEach函数，我们迭代数组并将值推送到各自的数组中。请注意，我们还要确保类型是有效的整数。

将对象数组中的字符串转换为数字数组

2 个答案: