Basic JavaScript - Access Multi-Dimensional Arrays With Indexes

JavaScript
1

Tell us what’s happening:
So I understand this to en extent and I am able to pass.

My question revolves on the Nested Array, and how in the intro it says that the element = 11.

I am looking to see if someone can explain how this works
const element = arr[3][0][1]; would work out to be 11 in the …

const arr = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9],
[[10, 11, 12], 13, 14]
];

I understand that 11 is in the sub array and in the nested array,

It is also in the position 3 in reference to the array that it is in

Its in the 2nd spot (aka 1) but I am confused on where the [0] fits in this arr= [3][0][1];?
like how does arr=[3][0][1]; equal 11???

Hopefully this explains my question and logic.

Your code so far

const myArray = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9],
  [[10, 11, 12], 13, 14],
];

const myData = myArray[2][1];
console.log(myData)

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Challenge: Basic JavaScript - Access Multi-Dimensional Arrays With Indexes

Link to the challenge:

2

I think you meant “how does arr[3][0][1] equal 11”.

Each one of those brackets is an array index, so just replace them with their actual values, starting at the left. For example, arr[3] is [[10, 11, 12], 13, 14] because that’s what’s in the fourth element of arr. So now you can write the original as:

[[10, 11, 12], 13, 14][0][1]

So what is the first element of the array [[10, 11, 12], 13, 14]? It’s [10, 11, 12], which is the value of [[10, 11, 12], 13, 14][0]. So you can rewrite [[10, 11, 12], 13, 14][0][1] as:

[10, 11, 12][1]

And then the the value of this is 11.

3

Is it because the 3rd array has a nest?

It’s the 3rd array [3]

then the nest is [0]

and it’s the 1 [1] value in the nest

which is
11?.?.?

Does that make sense?

I feel like what you said make sense, and I feel as though I’m getting it, just need clarification.

4

yes correct.
The 3rd index is itself a nested array.
and the 0th index of that is an array
and the 1th index of that is 11

5

Thank you @bbsmooth and @hbar1st !