12. Loops and arrays II


<Below this line, add a link to the EXACT exercise that you are stuck at.>

<Below this line, in what way does your code behave incorrectly? Include ALL error messages.>
Hi, i just finished this task by writing code below, it was accepted, but the output was strange:

I know someone called 1
I know someone called 2
I know someone called 3
I know someone called 4
I know someone called 5
I know someone called function (testArr) {
if (this.length !== testArr.length) return false;
for (var i = 0; i < testArr.length; i++) {
if (this[i].equal) {
if (!this[i].equal(testArr[i])) return false;
if (this[i] !== testArr[i]) return false;
return true;

Why did this happen?


var names = [“1”, “2”, “3”, “4”, “5”];
for (var name in names) {
console.log("I know someone called " + names[name]);

<do not remove the three backticks above>
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Hi their,

That isn’t the right way to make a for loop you make on like this:

for(var i = number; i < something; i++) {
   // code code code

so maybe if you did it like this:

var names = ["Steven","Will","Ezra","Patrick","Hannah"];

for(var i = 0; i < names.length; i++) {
    console.log("I know someone called " + names[i]);

it would work out,:relaxed:

hope this helps,


Did you just used the code below? Couldn’t reproduce it using the code on the exercise in the link.
Was there an error message or just this output?

PS: Also be careful to use “name” as a variable name because it is something like a keyword or at least has some features you would not expect it to have (e.g. it is always a string even if you assign a number or boolean).

Thanks for the answers,

I know how it should be using the names[i] syntax, I just wondered, what if I make it another way =)

I just cheched, and found something: if I just click “Save and Submit”, it works fine with no strange output. But if I previously finish task 11. Loops and arrays
with code (I don’t know, mb result will be same with another code)

var cities = [“Melbourne”, “Amman”, “Helsinki”, “NYC”, “”];

for (var i = 0; i < cities.length; i++) {
console.log("I would like to visit " + cities[i]);

and then do task 12 with code I wrote in the first post, the output has strange ending.
Looks like a bug


Thanks for your information. It seems like the test function of exercise 11 adds a new function to the array objects meaning all arrays have this new function that you can see. For a quick workaround you could just refresh the page that should get rid of this new “feature”. Anyway nothing wrong with your code and there will hopefully be a fix to this bug someday!

PS: As you can see for in loops might also reveal properties that you might not be aware of :slight_smile:

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