Transforming a string into an array of objects into an array of numerical values

Question

Transforming a string into an array of objects into an array of numerical values

Can anyone assist me in extracting an array of numbers from an array of objects with string values as properties? Below is an example of the array:

  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"
               }
           ]

I would like to extract obtainedScore and maxScore from these objects and store them in two different arrays.

Here is what I attempted:

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

However, this resulted in returning NaN.

javascript angularjs json

Answer 1

Answer №1

ANSWER OBTAINED FROM YOUR TRIAL:

    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)

MY SOLUTION (before your modification)

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);

Update: Radix parameter added for parseInt() following the advice of comment by jfriend00.

Answer 2

ANSWER OBTAINED FROM YOUR TRIAL:

    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)

MY SOLUTION (before your modification)

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);

Update: Radix parameter added for parseInt() following the advice of comment by jfriend00.

Answer 3

Answer №2

Have you considered projecting a mapping?

const topResults = results.map(result => parseInt(result.topScore, 10))
const achievedResults = results.map(result => parseInt(result.achievedScore, 10))

Answer 4

Have you considered projecting a mapping?

const topResults = results.map(result => parseInt(result.topScore, 10))
const achievedResults = results.map(result => parseInt(result.achievedScore, 10))

Answer 5

Answer №3

While I may not have a complete understanding of your desired outcome, here is a solution:

I would like to extract the obtainedScore and maxScore values from these objects and store them in two separate arrays.

let arrObtainedScores = [],
        arrMaxScores = [];

    scores.forEach(item => {
        arrObtainedScores.push(!isNaN(parseInt(item.obtainedScore)) ? parseInt(item.obtainedScore) : 0);
        arrMaxScores.push(!isNaN(parseInt(item.maxScore)) ? parseInt(item.maxScore) : 0);
    });

This code snippet generates two arrays: arrObtainedScores which contains each obtained score value individually, and arrMaxScores which holds an array of the maximum scores.

By utilizing the forEach function, we iterate through the array and assign the values to their respective arrays. Importantly, we validate that the values are valid integers before pushing them.

Answer 6

While I may not have a complete understanding of your desired outcome, here is a solution:

I would like to extract the obtainedScore and maxScore values from these objects and store them in two separate arrays.

let arrObtainedScores = [],
        arrMaxScores = [];

    scores.forEach(item => {
        arrObtainedScores.push(!isNaN(parseInt(item.obtainedScore)) ? parseInt(item.obtainedScore) : 0);
        arrMaxScores.push(!isNaN(parseInt(item.maxScore)) ? parseInt(item.maxScore) : 0);
    });

This code snippet generates two arrays: arrObtainedScores which contains each obtained score value individually, and arrMaxScores which holds an array of the maximum scores.

By utilizing the forEach function, we iterate through the array and assign the values to their respective arrays. Importantly, we validate that the values are valid integers before pushing them.

Answer 7

Answer №4

results = [
               {
                  topGrade:"A",
                  score:"87",
                  status:"pass",
                  subject:"History"
               },
               {
                  topGrade:"B",
                  score:"65",
                  status:"fail",
                  subject:"Geography"
               },
               {
                  topGrade:"A",
                  score:"92",
                  status:"pass",
                  subject:"Literature"
               }
           ];
           topGradeArray = [];
           scoreArray = [];

           for (var j = results.length - 1; j >= 0; j--) {
           topGradeArray.push(Number(results[j].topGrade));
           scoreArray.push(Number(results[j].score));
           }

           console.log(topGradeArray);
           console.log(scoreArray);

Answer 8

results = [
               {
                  topGrade:"A",
                  score:"87",
                  status:"pass",
                  subject:"History"
               },
               {
                  topGrade:"B",
                  score:"65",
                  status:"fail",
                  subject:"Geography"
               },
               {
                  topGrade:"A",
                  score:"92",
                  status:"pass",
                  subject:"Literature"
               }
           ];
           topGradeArray = [];
           scoreArray = [];

           for (var j = results.length - 1; j >= 0; j--) {
           topGradeArray.push(Number(results[j].topGrade));
           scoreArray.push(Number(results[j].score));
           }

           console.log(topGradeArray);
           console.log(scoreArray);

Transforming a string into an array of objects into an array of numerical values

Answer №1

Answer №2

Answer №3

Answer №4

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