Scope of properties in Javascript Object

Question

I am receiving this error in my console. Error is happening within my for loop Not sure why but when I console.log(manchesterUnited.[0].salary); I get not errors. I am new to JS so it could be something minor. Uncaught TypeError: Cannot read property 'salary' of undefined.

var footballer = function(name, position, age, salary, number) {
  this.name = name;
  this.position = position;
  this.age = age;
  this.salary = salary;
  this.number = number;
}

var manchesterUnited = [];
manchesterUnited[0] = new footballer("Zlatan", "striker", 37, 20, 9);
manchesterUnited[1] = new footballer("Rooney", "forward", 33, 15, 10);

var totalSalary = 0;

for(var i = 0; i <= manchesterUnited.length; i++){
    totalSalary = manchesterUnited[i].salary + totalSalary;
}

console.log(totalSalary);

Thank you.

Peter Schweitzer Jr · Accepted Answer · 2017-06-12 21:04:38Z

2

In the for loop, you have:

i <= manchesterUnited.length

It should just be:

i < manchesterUnited.length

answered Jun 12, 2017 at 21:04

Peter Schweitzer Jr

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1 Comment

Jared Smith Over a year ago

You might add the explanation that indicies start at 0 and thus the last element will be at array.length - 1.

quarterpi · Accepted Answer · 2017-06-12 21:26:34Z

0

You need to change this

     for(var i = 0; i <= manchesterUnited.length; i++){
           totalSalary = manchesterUnited[i].salary + totalSalary;
     }

To this

      for(var i = 0; i < manchesterUnited.length; i++){
            totalSalary = manchesterUnited[i].salary + totalSalary;
      }`

The reason being that the <= operator causes you to pass beyond the length of your array by 1.

answered Jun 12, 2017 at 21:26

quarterpi

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