# Understanding this exercise: Where do I Belong

Tell us what’s happening:
I’m working through my code. I got all but one test to pass. The failing test consists of an array of 4 numbers [5, 3, 20, 3]. I started debugging with console.log to find out what’s happening in the script. I can now see that the two 3s in the array share the same index of 0 and there is no index 1.

Is this the way it should be, seems odd to me.

Your code so far

``````function getIndexToIns(arr, num) {
let result = 0
let tempArr = arr.sort((a, b) => a - b);
console.log(`tempArr: \${tempArr}`)

for(let n = 0; n < tempArr.length; n++)
{
// if (num > tempArr[n] /* && num < tempArr[n + 1] */)
// {
console.log(n, tempArr.indexOf(tempArr[n]))
result = tempArr.indexOf(tempArr[n])

//}

}
//console.log(result)
return result
}

getIndexToIns([5, 3, 20, 3], 5);
``````

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Challenge: Basic Algorithm Scripting - Where do I Belong

Link to the challenge:

doesn’t this statement just equal n?
(the index of the item at position n is n?)

Yes, this is me debugging the code. This prints the value of n to the console and also the index of each item in the array. This is how I found out that the two 3s were sharing an index.

The array is not nested. It’s a simple array.

1 Like

if you have the following array and line of code (which is inside a for loop that loops from 0 to 3 (so n is 0, 1, 2, 3 as we loop around)

``````tempArr is [3, 3, 5, 20]
result = tempArr.indexOf(tempArr[n])
``````

then if we break apart the result statement
n is 0 for the first time in the loop
tempArr[0] is 3 (that’s the first element)
tempArr.indexOf(3) is 0 so result is 0 in the first loop

n is 1 now
tempArr[1] is 3 (that’s the 2nd element)
tempArr.indexOf(3) is 0 so result is 0 in the 2nd loop

Is this what you meant about sharing the same index?
(indexOf will give the index of the first occurrence unless you pass it a 2nd param to move the search forward. The 2nd param is the ‘fromIndex’ param)

Ah yeah my bad, looked too quickly at the issue and mistook the parens for brackets.

1 Like

^^ interesting information here. I will move accordingly with this info.

Thanks to @hbar1st I was able to move on from this one. I used:
`lastIndexOf()`

Glorious day

2 Likes

Yes! this is me And I am new here please help me for getting information

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