How do I nest a function within a function?

Hi all

So the problem seems straight forward, but I just can’t get a function to work within a function and I wonder what I am doing wrong

Here is function 1:

Here is function 1 within function 2:

And here is function 2 within function 3:

As you can see, nesting functions using the class ‘SudokuSolver’, declared at the top of the page, is one of the things I have tried in order to get this to work, but it does not

The current error I have is:

Any tips?

Thanks for your time


Your project link(s)


Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36

Challenge: Sudoku Solver

Link to the challenge:

Just had to type this. before each function, e.g. function 1 within function 2 became:

this.isRowOkForThisNum(board, row, col, num)

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