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JavaScript

Posted by brandonlind2
brandonlind2
7,823 Points

Does anyone know why this keeps returning an empty array?

This getIndexNames function keeps returning an empty array, I cant figure out why?

function Animal(age, name){
    this.age=age;
    this.name=name;
} 
var animals=[
    dog= new Animal(4, 'spike'),
    rat= new Animal(2, 'jack'),
    cat= new Animal(8, 'Penelope'),
    turtle= new Animal(10, 'Stoner'),     
];



function getIndexNames(arrayName){

        var names=[];

    for(var i=0; i >= arrayName.length; i++){
       names.push(arrayName[i].name);
        }

    return names
}

2 Answers

Arjuna Huffman
Arjuna Huffman
2,400 Points
Arjuna Huffman
Arjuna Huffman
2,400 Points

Hi again,

I typed it out and tested it in the console and got it to work.. If you try

function Animal(age, name){ this.age=age; this.name=name; } var animals=[ new Animal(4, 'spike'), new Animal(2, 'jack'), new Animal(8, 'Penelope'), new Animal(10, 'Stoner')
];

function getIndexNames(arrayName){

    var names=[];

for(var i=0; i < arrayName.length; i++){
   names.push(arrayName[i].name);
    }

return names;

}

var returnedArr = getIndexNames(animals);

console.log(returnedArr);

Arjuna Huffman
Arjuna Huffman
2,400 Points

I need to learn how to post code... Sorry for that mess, haha :)

brandonlind2
brandonlind2
7,823 Points

Thanks!! yeah that's working :) I seen now I put >= instead of <=. I'm confused though I think <= is a comparison operator that should work if < does.

brandonlind2
brandonlind2
7,823 Points

dont worry about the ```javascript I have the same problem before just wouldnt work for me lol

Arjuna Huffman
Arjuna Huffman
2,400 Points
Arjuna Huffman
Arjuna Huffman
2,400 Points

var animals=[ new Animal(4, 'spike'), new Animal(2, 'jack'), new Animal(8, 'Penelope'), new Animal(10, 'Stoner') ];

You can't assign variables inside of an array, and you don't have to put a comma after the last element of the array. I think it should work if you use the array I typed out above, but I haven't tested it.

Arjuna Huffman
Arjuna Huffman
2,400 Points

Also, when looping over an array the following syntax looks better, I think: i < arrayName.length

brandonlind2
brandonlind2
7,823 Points

thanks, I see thats not needed by arrays now lol still not working though for some reason.