Clarify quicksort algorithm step 6: pointer positions vs values

[Copilot]

Step 6 of the quicksort algorithm description was ambiguous—stating "if the left pointer is less than or equal to the right pointer" could be misread as comparing values instead of array indices. In the walkthrough example, the left pointer holds value 6 and the right pointer holds value 3, yet they swap (correctly, because position 2 < position 4).

Changes

• Step 6: Added "position" qualifier to clarify comparison is between indices, not values

  • Before: "If the left pointer is less than or equal to the right pointer..."
  • After: "If the left pointer position is less than or equal to the right pointer position..."

• Example text: Fixed two grammatical errors ("in the right pointer" → "and the right pointer")

Screenshot

The change resolves the apparent contradiction where position 2 < position 4 triggers a swap, even though value 6 > value 3.

Warning

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Original prompt

I noticed that your pseudocode does not match your example and wanted to verify this with you.

On this page:

https://humanwhocodes.com/blog/2012/11/27/computer-science-in-javascript-quicksort/

step 6

If the left pointer is less than or equal to the right pointer, then swap the values at these locations in the array.

However, in the example

the left pointer is 6 and the right pointer is 3. And yet they are swapped.

Is this a typo or am I reading this wrong?

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