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JavaScript JavaScript Loops, Arrays and Objects Tracking Data Using Objects The Build an Object Challenge, Part 2 Solution

Posted by milesindia
milesindia
3,001 Points

Assigning Object to Array elements

What is wrong with the following Code 

var students = [];
var studentRec= {};
var names = ['name1','name2','name3','name4','name5'];
var tracks = ['Frontend Development','iOS','Web Design','Core Java','Groovy Grails'];

// Populate students array 
for ( var i=0 ; i<=4 ; i+=1) {
  studentRec.name = names[i];
  studentRec.track = tracks[i];
  studentRec.achievements = i;
  studentRec.points = i;
  students[i] = Object.create(studentRec);
}

// Display students array 
for ( var i =0; i < students.length; i+=1) {
 document.write ('{');
    for ( var key in students[i]) {
      document.write (key , ':', students[i][key] , ',');
    }
document.write ('} <br>');
}

The output is :

Students

{name:name5,track:Groovy Grails,achievements:4,points:4,} 
{name:name5,track:Groovy Grails,achievements:4,points:4,} 
{name:name5,track:Groovy Grails,achievements:4,points:4,} 
{name:name5,track:Groovy Grails,achievements:4,points:4,} 
{name:name5,track:Groovy Grails,achievements:4,points:4,}

1 Answer

Kyle Adkins
Kyle Adkins
11,315 Points
Kyle Adkins
Kyle Adkins
11,315 Points

It's because every time your first "for" loop runs, all it's doing is reassigning the last value for i to all of those keys, until it ends on 4. Try deleting your second "for" loop & including the code you use to print out the values in that loop in your first loop. Hope that helps.