Getting "undefined" when adding an object to a new string

Question

I have an array of objects (student name, achievement, etc..) and I want to add any object that has the name "Jody" (for example) in a new empty array I created. However, when I try to print the name only of the new array of objects I get the undefined. Note: I can't use let, const etc..

Any ideas what I'm missing here?

var student;
var newStudents = [];
var students = [{
    name: 'Odelia',
    track: 'Accounting',
    achievements: '26',
    points: '2260'
}, {
    name: 'Jody',
    track: 'Web Design',
    achievements: '12',
    points: '890'
}, {
    name: 'Yann',
    track: 'Javascript',
    achievements: '10',
    points: '2266'
}, {
    name: 'Max',
    track: 'Marketing',
    achievements: '13',
    points: '1010'
}, {
    name: 'Jody',
    track: 'iOS',
    achievements: '9',
    points: '1002'
}, ]

for (var i = 0; i < students.length; i++) {
    student = students[i];
    if (student.name === 'Jody') {
        newStudents.push(student);
    }
}

console.log(newStudent.name);

output:

    0: 
      achievements: "12"
      name: "Jody"
      points: "890"
      track: "Web Design"
      __proto__: Object
    1: 
      achievements: "9"
      name: "Jody"
      points: "1002"
      track: "iOS"
      __proto__: Object
      length: 2
      __proto__: Array(0)

    undefined

Should be console.log(newStudent[0].name); Because newStudent is a array — Tan Duong
– Tan Duong, Commented Apr 24, 2018 at 9:21
Is console.log(newStudent.name); a typo? The array is called newStudents, plural. If that's what you meant, then it's undefined because arrays don't have a name property. — Máté Safranka
– Máté Safranka, Commented Apr 24, 2018 at 9:23
yes guys sorry a typo from newStudent to newStudents with an s — Yann Bohbot
– Yann Bohbot, Commented Apr 24, 2018 at 9:29

xianshenglu · Accepted Answer · 2018-04-24 09:23:22Z

4

should be newStudentsnot newStudent

    console.log(newStudents[0].name);

Also,newStudents is Array.

answered Apr 24, 2018 at 9:23

xianshenglu

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Comments

Rohit Sharma · Accepted Answer · 2018-04-24 09:26:52Z

0

You are trying to print name outside of the loop. Cross check it again.

It should be like this:

for (var i = 0; i < students.length; i++) {
    student = students[i];
    console.log(newStudent.name);
    if (student.name === 'Jody') {
        newStudents.push(student);
    }
}

answered Apr 24, 2018 at 9:26

Rohit Sharma

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Comments

AmitD · Accepted Answer · 2018-04-24 09:44:36Z

0

@Yann Bohbot,

There are 2 issues, 1. Put correct object name i.e. "newStudents" and NOT "newStudent" in console.log(); 2. You need to change below line to get values, console.log(newStudents[1].name);

Your are using multidimensional array and need iterate in proper way... :)

answered Apr 24, 2018 at 9:44

AmitD

116 bronze badges

Comments

Dimitri G · Accepted Answer · 2023-03-19 11:38:48Z

Try this, it's work for me;

const students    = [
    {
        name:         'Odelia',
        track:        'Accounting',
        achievements: '26',
        points:       '2260',
    },
    {
        name:         'Jody',
        track:        'Web Design',
        achievements: '12',
        points:       '890',
    },
    {
        name:         'Yann',
        track:        'Javascript',
        achievements: '10',
        points:       '2266',
    },
    {
        name:         'Max',
        track:        'Marketing',
        achievements: '13',
        points:       '1010',
    },
    {
        name:         'Jody',
        track:        'iOS',
        achievements: '9',
        points:       '1002',
    },
];

const newStudents = [];
for ( const student of students ) {
    if ( student.name === 'Jody' ) {
        newStudents.push( student );
    }
}

Or you can use filter :

const newStudents = students.filter( student => student.name === 'Jody' );

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