# Hackerrank challenge

Link to the challenge here
Why doesn’t the following work?

``````function compareTriplets(a, b) {
const array = [0,0]
array.forEach(function (item,i) {
if (a[i] < b[i]) {
array[1] +=1
} else if (a[i] > b[i]) {
array[0] +=1
} else { array[1] += 0

}

})
if (a[2] < b[2]) {
array[1] +=1
} else if (a[2] > b[2]) {
array[0] +=1
} else { array[1] += 0

}

return array

}
//console.log(compareTriplets([1,1,1], [2,2,2]))
``````

Why do you have this part of the code here? What does it do?

What does this part do, why do you need it?
What does `forEach` do?

You may want to review what `forEach` does, and console.log the parameters of the callback function to know what they are.

You may also want to start writing first pseudocode for the algorithm, to the smallest steps.

1 Like

@newbiewebdeveloper you have to iterate over `a` or `b`. not over `array`.

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I tried and I solve it!!!
There it’s my js code! lol…

``````// Complete the compareTriplets function below.
function compareTriplets(a, b) {
var result = [0, 0];
for (let i = 0; i < a.length; i++) {
if (a[i] > b[i]) {
result[0] += 1;
} else if (a[i] < b[i]) {
result[1] += 1;
} else if(a[i] = b[i]) {
console.log("don't know what to write in there")
}

}
return result;

}
``````

This is not a comparison, that is the assignment operator `=`, you want to use `==` or `===`. Also you could have just used `else {...}`, or just nothing as you don’t have to do anything in that case

1 Like